Gas Leak Detectors

Which gas leak detector should you buy in 2026?

Short answer: To pinpoint a leak source — not test an atmosphere — the right tool is a handheld leak detector matched to the gas: a combustible gas leak detector for natural gas (methane) and propane lines, a refrigerant leak detector for HVAC/R systems, and an ultrasonic detector for high-pressure leaks you can hear before you can smell. For continuous safety monitoring of a space, use a portable or fixed monitor instead.

Gas leak detectors are handheld “sniffers” with a flexible probe used to trace a leak to its exact source — along a pipe joint, a fitting or an appliance connection. They are the diagnostic tool of the Gas Detectors hub: where Portable Gas Detectors and Personal & Wearable Gas Detectors answer “is this air safe to breathe?”, a leak detector answers “where exactly is the gas coming from?” For unattended safety monitoring use Fixed Gas Detection Systems or Area & Transportable Gas Monitors. Residential combustible-gas and CO leak alarms live in Carbon Monoxide Alarms & Detectors.

Editor's pick for most buyers — a combustible gas leak detector with a flexible probe
For gas-line and appliance work, a handheld combustible leak detector with a gooseneck probe and adjustable sensitivity finds methane and propane leaks fast — the single most useful sniffer for trades and facilities, and far cheaper than a full monitor. As an Amazon Associate, WC Safety earns from qualifying purchases (tag wcsafety04-20).

BROWSE ALL GAS DETECTORS → CHECK PRICES ON AMAZON →

What this collection covers

Leak detectors are grouped by the leak they find and how they sense it:

• Combustible gas leak detectors — sniff natural gas (methane) and propane along pipes, fittings and appliances; usually a semiconductor sensor with a flexible probe.
• Refrigerant leak detectors — find HVAC/R refrigerant leaks (heated-diode or infrared sensors) at low loss rates measured in ounces per year.
• Ultrasonic leak detectors — hear the high-frequency hiss of pressurized gas or air leaks even where a sniffer can’t reach.
• Combination CO / explosive-gas alarms — plug-in residential units that warn of a methane or propane leak; see Carbon Monoxide Alarms & Detectors.

Gas leak detector types compared

Compared by target leak and sensing method. Approximate street-price ranges reflect the broad market, not WC Safety quotes.

Which gas leak detector should you choose?

• Choose a combustible gas leak detector for natural-gas and propane work — appliance hookups, line repairs and pressure-test follow-ups.
• Choose a refrigerant leak detector for HVAC/R service, where you need to find small refrigerant losses to recharge and seal a system.
• Choose an ultrasonic detector for high-pressure compressed-air or gas leaks, or leaks behind panels and at distance that a sniffer can’t reach.
• Need to know if the air is safe, not just where the leak is? Use a portable gas detector to measure concentration and oxygen, or a fixed system for continuous monitoring.
• Protecting a home or small shop? A plug-in combustible-gas and CO alarm from Carbon Monoxide Alarms & Detectors gives always-on warning.

Shop gas leak detectors on Amazon → Combustible leak detector Refrigerant detector Ultrasonic detector Natural gas / propane

How to choose a gas leak detector

Match the detector to the gas

A combustible sniffer finds methane and propane; a refrigerant detector finds HVAC/R refrigerants; an ultrasonic detector finds pressurized leaks by sound. Using the wrong type wastes time — confirm the target gas first.

Sensitivity and adjustability

Look for adjustable sensitivity so you can find the general area on high, then dial down to pinpoint the exact joint. Refrigerant detectors are rated by the smallest leak they catch, in ounces per year.

Probe reach and ergonomics

A long, flexible gooseneck probe reaches behind appliances and under fittings. Tick-rate and visual bargraph feedback help you home in on the source.

Response and recovery time

Faster sensor response and recovery let you sweep a line quickly and re-test the same spot without waiting for the sensor to clear.

Leak detection is diagnosis, not monitoring

A leak detector tells you where gas escapes; it does not continuously guard a space or measure exposure. Pair it with a portable or fixed monitor for safety.

Leak detection, safety and refrigerant rules

Pinpointing and repairing leaks reduces both explosion risk (combustible gases) and exposure, and supports refrigerant-management practice in HVAC/R. A leak detector is a diagnostic instrument — it does not measure whether an atmosphere meets OSHA Permissible Exposure Limits or is safe to enter. For that, and for confined spaces, use a calibrated portable gas detector; for ongoing protection of an area, a fixed gas detection system.

Related gas-detection categories

This collection is one of five form-factor hubs under Gas Detectors. Match the form factor to how the instrument is used, then narrow by the gases you need to detect:

• Portable Gas Detectors — Handheld single- and multi-gas instruments for spot checks, confined-space entry, and leak surveys.
• Personal & Wearable Gas Detectors — Clip-on monitors worn in the breathing zone for single-worker exposure alarms.
• Fixed Gas Detection Systems — Wall- and structure-mounted transmitters for continuous, unattended plant monitoring.
• Area & Transportable Gas Monitors — Transportable multi-gas monitors for perimeter and multi-zone temporary coverage.
• All Gas Detectors — the full gas-detection hub.

Frequently asked questions

What does a gas leak detector do?

It pinpoints the exact source of a gas leak — at a pipe joint, fitting or appliance — using a probe and an increasing tick-rate or bargraph as you near the leak. It locates leaks rather than measuring whether an atmosphere is safe.

Gas leak detector vs gas monitor — what’s the difference?

A leak detector finds where gas escapes; a gas monitor measures concentration and oxygen to tell you if the air is safe to breathe. You often use both — find the leak, then confirm the space is clear.

What detects a natural gas or propane leak?

A combustible gas leak detector — typically a handheld semiconductor or catalytic sniffer with a flexible probe and adjustable sensitivity, tuned to methane and propane.

How do I find a refrigerant leak?

Use a refrigerant leak detector (heated-diode or infrared) rated for small leaks in ounces per year. Sweep joints, fittings and coils slowly with the probe until the alarm rate climbs.

What is an ultrasonic leak detector?

A detector that hears the high-frequency sound of gas or air escaping under pressure — useful for high-pressure leaks, leaks behind panels, and leaks at a distance a sniffer can’t reach.

Can a leak detector tell me if a space is safe to enter?

No — it locates leaks but does not measure exposure or oxygen. For entry safety use a calibrated portable gas detector.

Do I need a different detector for each gas?

Largely yes — combustible, refrigerant and ultrasonic detectors work on different principles. Some combustible detectors cover several flammable gases, but refrigerant work needs a refrigerant-specific tool.

How sensitive should a gas leak detector be?

Sensitive enough to find the leak but adjustable so you can pinpoint it — start high to locate the area, then reduce sensitivity to isolate the exact joint. Refrigerant detectors quote a minimum detectable leak rate.

Will a gas leak detector find a carbon monoxide leak?

Combustible leak detectors target methane and propane, not CO. For carbon monoxide, use a CO monitor or a residential alarm from Carbon Monoxide Alarms & Detectors.

Is a plug-in explosive-gas alarm the same as a leak detector?

No — a plug-in alarm gives always-on warning at a fixed spot, while a handheld leak detector lets you trace a leak to its source. Both have a place; see Carbon Monoxide Alarms & Detectors for plug-in alarms.

How do I maintain a gas leak detector?

Keep the probe and sensor clean, replace sensors per the manufacturer’s schedule, and verify response against a known small leak source periodically so you trust the readings.