Klein Tools ET120 Gas Leak Detector — Combustible (18-in Gooseneck, 50-10,000 ppm)

Klein Tools ET120 Gas Leak Detector — Combustible Gas Tester

The Klein Tools ET120 gas leak detector pinpoints combustible gases such as natural gas (methane), propane and butane with an 18-inch gooseneck and adjustable sensitivity — the gas leak detector trades and facilities reach for to trace a leak to its exact source. It locates the leak; it does not measure whether the air is safe to breathe.

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The Klein Tools ET120 is a handheld combustible gas leak detector with an 18-inch gooseneck probe, a 50-10,000 ppm range and adjustable sensitivity for pinpointing natural-gas and propane leaks.

Key features

• Pinpoints combustible-gas leaks from 50 to 10,000 ppm across a wide sensitivity range
• 18-inch flexible gooseneck reaches behind appliances, under fittings and into tight joints
• Adjustable sensitivity to find the area first, then dial in the exact leak point
• Audible tick-rate plus visual indication that climbs as you near the source
• Most-reviewed leak detector we stock (1,800+ ratings, 4.6 stars)
• Includes a storage pouch and batteries

Specifications

Where the Klein Tools ET120 fits

• Natural-gas line and appliance leak checks
• Propane and LP system service
• Post-repair pressure-test verification
• Plumbing and HVAC gas work
• Facilities maintenance leak surveys

What the Klein Tools ET120 detects (and what it doesn’t)

The ET120 finds combustible gases such as natural gas (methane), propane and butane — it does not detect refrigerants, carbon monoxide, oxygen levels or specific toxics. For refrigerant work choose a Fieldpiece DR58 or Elitech ILD-200; for CO use the Carbon Monoxide Alarms & Detectors range. Crucially, a leak detector tells you where gas escapes, not whether a space is safe to enter — for that, use a Portable Gas Detectors monitor or a Personal & Wearable Gas Detectors clip. Adjustable sensitivity lets you locate the area, then pinpoint the joint.

Cross-shopping? This unit sits in our Gas Leak Detectors hub alongside Forensics Gas Leak Detector, TopTes PT-830S, TopTes PT520A, TopTes PT210S. For other gas-detection form factors see Portable Gas Detectors, Personal & Wearable Gas Detectors, Fixed Gas Detection Systems, or browse the full Gas Detectors range.

How the Klein ET120 compares

The ET120 is a premium combustible leak detector with a long 18-inch gooseneck and a deep review record. For lower-cost combustible sniffers, compare the TopTes PT520A (17-in gooseneck) and TopTes PT210S; for a rechargeable color-display option, the TopTes PT-830S.

• Choose the Klein ET120 for a trusted-brand combustible sniffer with a long gooseneck and the deepest review record.
• Save money with the TopTes PT520A or TopTes PT210S combustible detectors.
• Need refrigerant detection instead? See the Fieldpiece DR58.

Frequently asked questions

What does the Klein Tools ET120 detect?

It detects combustible gases such as natural gas (methane), propane and butane from 50 to 10,000 ppm. It does not detect refrigerants, CO or oxygen — for those, use the matching instrument from the Gas Detectors hub.

How long is the ET120 probe?

It has an 18-inch flexible gooseneck that holds its shape, so you can reach behind appliances, under fittings and into tight joints.

Can the ET120 tell me if a space is safe to enter?

No — it locates leaks, it does not measure concentration or oxygen. For entry safety use a Portable Gas Detectors gas monitor or a Personal & Wearable Gas Detectors clip.

How do I pinpoint a leak with adjustable sensitivity?

Start on high sensitivity to find the general area, then lower the sensitivity to zero in on the exact joint where the tick-rate peaks.

Is the ET120 rechargeable?

No — it runs on batteries, which are included along with a storage pouch. Keep spares for long survey jobs.

What is the detection range?

50 to 10,000 ppm of combustible gas, which covers everything from a faint trace to a substantial leak as you sweep a line.

Will the ET120 find a propane leak?

Yes — it detects propane and other combustible gases including natural gas and methane, making it suitable for LP system service.

How does it signal a leak?

An audible tick-rate and visual indication increase as gas concentration rises, guiding you to the source.

Does the ET120 detect refrigerant or CO?

No — it is combustible-gas only. For refrigerant use the Fieldpiece DR58; for carbon monoxide see the Carbon Monoxide Alarms & Detectors range.

Is it in stock and how does it ship?

Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.

Do I need to calibrate the ET120?

Combustible leak detectors are not field-calibrated like monitors; verify response against a known small gas source periodically so you trust the readings.

How does the ET120 compare to the TopTes combustible detectors?

The ET120 is a premium Klein-brand unit with an 18-inch gooseneck; the TopTes PT520A and PT210S are lower-cost alternatives.