{"product_id":"toptes-pt520a-gas-leak-detector","title":"TopTes PT520A Gas Leak Detector — 17-in Gooseneck (Natural Gas, Propane, Methane)","description":"\u003c!-- PRODUCT B0BTM3G8DK | tag gas-leak-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the TopTes PT520A gas leak detector is one of the instruments we curate in our \u003ca href=\"\/collections\/gas-leak-detectors\" title=\"Gas Leak Detectors\"\u003eGas Leak Detectors\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/klein-tools-et120-gas-leak-detector\" title=\"Klein Tools ET120\"\u003eKlein Tools ET120\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eTopTes PT520A Gas Leak Detector — 17-Inch Gooseneck Sniffer\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eTopTes PT520A gas leak detector\u003c\/strong\u003e is the value workhorse — a \u003ca href=\"\/collections\/gas-leak-detectors\" title=\"gas leak detector\"\u003egas leak detector\u003c\/a\u003e with a 17-inch gooseneck for combustible gases such as natural gas (methane), propane and butane and a huge review base. Affordable enough to put in every truck, it traces the leak source without claiming to measure air safety.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe TopTes PT520A is an affordable combustible gas leak detector with a 17-inch gooseneck probe and audible\/visual alarms for natural gas, propane and methane.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eTraces natural gas, propane, methane and butane leaks to the source\u003c\/li\u003e\n\u003cli\u003eLong 17-inch gooseneck reaches behind and under appliances and fittings\u003c\/li\u003e\n\u003cli\u003eAudible tick-rate and visual indication that climb near the leak\u003c\/li\u003e\n\u003cli\u003eOur best-selling leak detector — 3,800+ ratings at 4.6 stars\u003c\/li\u003e\n\u003cli\u003eRuns on AA batteries (three included) — grab-and-go simplicity\u003c\/li\u003e\n\u003cli\u003eAffordable enough to keep one in every truck and toolbox\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eLowest-cost long-gooseneck sniffer\u003c\/li\u003e\n\u003cli\u003eHuge 3,800+ review track record (4.6)\u003c\/li\u003e\n\u003cli\u003e17-inch reach\u003c\/li\u003e\n\u003cli\u003eSimple AA-battery operation\u003c\/li\u003e\n\u003cli\u003eGreat value for trucks\/tool cribs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eLocates leaks — not an atmosphere safety monitor\u003c\/li\u003e\n\u003cli\u003eCombustible gases only\u003c\/li\u003e\n\u003cli\u003eTick-rate readout only (no concentration display)\u003c\/li\u003e\n\u003cli\u003eNot for confined-space entry\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eFinds\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eNatural gas, propane, methane, butane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eProbe\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e17-inch gooseneck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eAlarm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eAudible tick-rate + visual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eAA batteries (3 included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eUse\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eHome, RV and light-industrial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eColor\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eOrange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the TopTes PT520A fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eNatural-gas and propane leak checks\u003c\/li\u003e\n\u003cli\u003eAppliance, RV and grill connections\u003c\/li\u003e\n\u003cli\u003ePlumbing and HVAC gas lines\u003c\/li\u003e\n\u003cli\u003eTruck\/toolbox spare sniffer\u003c\/li\u003e\n\u003cli\u003eQuick recheck after a repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the TopTes PT520A detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eIt finds combustible gases such as natural gas (methane), propane and butane — not refrigerants, CO or oxygen. For refrigerant work see the \u003ca href=\"\/products\/toptes-rt-389-refrigerant-leak-detector\" title=\"TopTes RT-389\"\u003eTopTes RT-389\u003c\/a\u003e; for CO the \u003ca href=\"\/collections\/carbon-monoxide-alarms-detectors\" title=\"Carbon Monoxide Alarms \u0026amp; Detectors\"\u003eCarbon Monoxide Alarms \u0026amp; Detectors\u003c\/a\u003e range. It locates leaks; it does not measure whether a space is safe — use a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e monitor for entry decisions. The long gooseneck and tick-rate make it easy to sweep a line and pinpoint the joint.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/gas-leak-detectors\" title=\"Gas Leak Detectors\"\u003eGas Leak Detectors\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/klein-tools-et120-gas-leak-detector\" title=\"Klein Tools ET120\"\u003eKlein Tools ET120\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-detectors-gas-leak-detector\" title=\"Forensics Gas Leak Detector\"\u003eForensics Gas Leak Detector\u003c\/a\u003e, \u003ca href=\"\/products\/toptes-pt-830s-gas-leak-detector\" title=\"TopTes PT-830S\"\u003eTopTes PT-830S\u003c\/a\u003e, \u003ca href=\"\/products\/toptes-pt210s-gas-leak-detector\" title=\"TopTes PT210S\"\u003eTopTes PT210S\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eTopTes combustible leak detector family compared\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eTopTes combustible gas leak detector family (natural gas, propane, methane)\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eProbe\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eDisplay \/ readout\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003ePower\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/toptes-pt210s-gas-leak-detector\" title=\"PT210S\"\u003ePT210S\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e4 in fixed\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e%LEL bar + alarm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eAA batteries\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/toptes-pt520a-gas-leak-detector\" title=\"PT520A\"\u003ePT520A\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e17 in gooseneck\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eTick-rate + alarm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eAA batteries\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/toptes-pt-830s-gas-leak-detector\" title=\"PT-830S\"\u003ePT-830S\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e14.5 in flexible\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eTFT color, 0-10000 ppm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRechargeable\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$96\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003ePT520A\u003c\/strong\u003e for the best value long-gooseneck combustible sniffer with a massive review record.\u003c\/li\u003e\n\u003cli\u003eStep up to the \u003ca href=\"\/products\/toptes-pt-830s-gas-leak-detector\" title=\"PT-830S\"\u003ePT-830S\u003c\/a\u003e for rechargeable power and a color concentration display.\u003c\/li\u003e\n\u003cli\u003eGo cheaper\/smaller with the \u003ca href=\"\/products\/toptes-pt210s-gas-leak-detector\" title=\"PT210S\"\u003ePT210S\u003c\/a\u003e 4-inch %LEL sniffer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat does the TopTes PT520A detect?\u003c\/h3\u003e\u003cp\u003eCombustible gases — natural gas, propane, methane and butane. It does not detect refrigerants, CO or oxygen.\u003c\/p\u003e\n\u003ch3\u003eHow long is the PT520A gooseneck?\u003c\/h3\u003e\u003cp\u003e17 inches and flexible, giving excellent reach behind and under appliances and along fittings.\u003c\/p\u003e\n\u003ch3\u003eIs the PT520A rechargeable?\u003c\/h3\u003e\u003cp\u003eNo — it runs on AA batteries (three included). For a rechargeable model with a color display, see the \u003ca href=\"\/products\/toptes-pt-830s-gas-leak-detector\" title=\"PT-830S\"\u003ePT-830S\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhy is the PT520A so popular?\u003c\/h3\u003e\u003cp\u003eIt pairs a long gooseneck and reliable tick-rate alarm with a very low price, which is why it has over 3,800 ratings and is a common truck\/toolbox staple.\u003c\/p\u003e\n\u003ch3\u003eCan it tell me if a space is safe to enter?\u003c\/h3\u003e\u003cp\u003eNo — it locates leaks only. Measure entry conditions with a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e monitor or \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e clip.\u003c\/p\u003e\n\u003ch3\u003eHow do I pinpoint the leak?\u003c\/h3\u003e\u003cp\u003eSweep slowly along the line; the audible tick-rate speeds up and the visual indicator climbs as you approach, peaking at the leak.\u003c\/p\u003e\n\u003ch3\u003eDoes it show the gas concentration?\u003c\/h3\u003e\u003cp\u003eIt uses a tick-rate and visual indicator rather than a numeric display. For a concentration readout, choose the \u003ca href=\"\/products\/toptes-pt-830s-gas-leak-detector\" title=\"PT-830S\"\u003ePT-830S\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eDoes it detect refrigerant or CO?\u003c\/h3\u003e\u003cp\u003eNo — for refrigerant use the \u003ca href=\"\/products\/toptes-rt-389-refrigerant-leak-detector\" title=\"TopTes RT-389\"\u003eTopTes RT-389\u003c\/a\u003e; for CO see the \u003ca href=\"\/collections\/carbon-monoxide-alarms-detectors\" title=\"Carbon Monoxide Alarms \u0026amp; Detectors\"\u003eCarbon Monoxide Alarms \u0026amp; Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\u003ch3\u003eWill it find a propane or grill leak?\u003c\/h3\u003e\u003cp\u003eYes — it detects propane and butane, which makes it handy for grills, RVs and LP appliances as well as natural-gas lines.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eHow does it compare to the Klein ET120?\u003c\/h3\u003e\u003cp\u003eThe \u003ca href=\"\/products\/klein-tools-et120-gas-leak-detector\" title=\"Klein ET120\"\u003eKlein ET120\u003c\/a\u003e adds a numeric ppm range and trusted-brand build at a higher price; the PT520A is the budget long-gooseneck option.\u003c\/p\u003e\n\u003ch3\u003eCan I use it for confined-space work?\u003c\/h3\u003e\u003cp\u003eOnly to find a leak — entry still requires atmospheric testing with a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e 4-gas instrument.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eTopTes PT520A gas leak detector\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/gas-leak-detectors\" title=\"Gas Leak Detectors\"\u003eGas Leak Detectors\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B0BTM3G8DK?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this TopTes page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for TopTes PT520A and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/toptes-pt520a-gas-leak-detector#product\", \"name\": \"TopTes PT520A Gas Leak Detector — 17-in Gooseneck (Natural Gas, Propane, Methane)\", \"description\": \"TopTes PT520A gas leak detector — combustible sniffer with 17-in gooseneck for natural gas, propane and methane. 3,800+ reviews. Order at WC Safety.\", \"sku\": \"B0BTM3G8DK\", \"mpn\": \"PT520A\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/toptes-pt520a-gas-leak-detector.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"TopTes\"}, \"category\": \"Gas Leak Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/gas-leak-detectors#collection\", \"name\": \"Gas Leak Detectors\", \"url\": \"https:\/\/wcsafety.com\/collections\/gas-leak-detectors\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Klein Tools ET120 Combustible Gas Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/klein-tools-et120-gas-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"Forensics Detectors Gas Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-detectors-gas-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"TopTes PT-830S Gas Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-pt-830s-gas-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"TopTes PT210S Gas Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-pt210s-gas-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"Fieldpiece DR58 Refrigerant Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/fieldpiece-dr58-refrigerant-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"Elitech ILD-200 Refrigerant Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/elitech-ild-200-refrigerant-leak-detector\"}, {\"@type\": \"Product\", \"name\": \"TopTes RT-389 Refrigerant Leak Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-rt-389-refrigerant-leak-detector\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-pt520a-gas-leak-detector\", \"priceCurrency\": \"USD\", \"price\": \"42.49\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/toptes-pt520a-gas-leak-detector#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Gas Leak Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-leak-detectors\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"TopTes PT520A Gas Leak Detector — 17-in Gooseneck (Natural Gas, Propane, Methane)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the TopTes PT520A detect?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Combustible gases — natural gas, propane, methane and butane. It does not detect refrigerants, CO or oxygen.\"}}, {\"@type\": \"Question\", \"name\": \"How long is the PT520A gooseneck?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"17 inches and flexible, giving excellent reach behind and under appliances and along fittings.\"}}, {\"@type\": \"Question\", \"name\": \"Is the PT520A rechargeable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it runs on AA batteries (three included). For a rechargeable model with a color display, see the PT-830S.\"}}, {\"@type\": \"Question\", \"name\": \"Why is the PT520A so popular?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It pairs a long gooseneck and reliable tick-rate alarm with a very low price, which is why it has over 3,800 ratings and is a common truck\/toolbox staple.\"}}, {\"@type\": \"Question\", \"name\": \"Can it tell me if a space is safe to enter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it locates leaks only. Measure entry conditions with a Portable Gas Detectors monitor or Personal \u0026 Wearable Gas Detectors clip.\"}}, {\"@type\": \"Question\", \"name\": \"How do I pinpoint the leak?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Sweep slowly along the line; the audible tick-rate speeds up and the visual indicator climbs as you approach, peaking at the leak.\"}}, {\"@type\": \"Question\", \"name\": \"Does it show the gas concentration?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It uses a tick-rate and visual indicator rather than a numeric display. For a concentration readout, choose the PT-830S.\"}}, {\"@type\": \"Question\", \"name\": \"Does it detect refrigerant or CO?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — for refrigerant use the TopTes RT-389; for CO see the Carbon Monoxide Alarms \u0026 Detectors range.\"}}, {\"@type\": \"Question\", \"name\": \"Will it find a propane or grill leak?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it detects propane and butane, which makes it handy for grills, RVs and LP appliances as well as natural-gas lines.\"}}, {\"@type\": \"Question\", \"name\": \"Is it in stock and how does it ship?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.\"}}, {\"@type\": \"Question\", \"name\": \"How does it compare to the Klein ET120?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Klein ET120 adds a numeric ppm range and trusted-brand build at a higher price; the PT520A is the budget long-gooseneck option.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use it for confined-space work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Only to find a leak — entry still requires atmospheric testing with a Portable Gas Detectors 4-gas instrument.\"}}]}, {\"@type\": \"Organization\", \"@id\": \"https:\/\/wcsafety.com\/#org\", \"name\": \"WC Safety\", \"url\": \"https:\/\/wcsafety.com\", \"logo\": \"https:\/\/wcsafety.com\/cdn\/shop\/files\/logo.png\"}, {\"@type\": \"Person\", \"@id\": \"https:\/\/wcsafety.com\/#editor\", \"name\": \"Steven Eaton\", \"jobTitle\": \"Editorial Lead\", \"worksFor\": {\"@id\": \"https:\/\/wcsafety.com\/#org\"}, \"knowsAbout\": [\"industrial gas detection\", \"atmospheric monitoring\", \"personal protective equipment\"]}, {\"@type\": \"Brand\", \"name\": \"TopTes\"}]}\n\u003c\/script\u003e","brand":"TopTes","offers":[{"title":"Default Title","offer_id":44266483286104,"sku":"B0BTM3G8DK","price":42.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/718k6noTUgL._AC_SL1500.jpg?v=1782122413","url":"https:\/\/wcsafety.com\/products\/toptes-pt520a-gas-leak-detector","provider":"WC Safety","version":"1.0","type":"link"}