Klein Tools ET120 Combustible Gas Leak Detector Review: Home Inspection Fit and Alternatives

Klein Tools ET120 buying assessment for home inspectors: documented capabilities, inspection limitations, reporting and alternatives.

By TradeGear HQ editorial desk · Reviewed October 4, 2026 · Research methodology

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Combustible Gas Leak Detector - ET120 | Klein Tools — Product image: Klein Tools. Check the listing for included accessories.

Dedicated combustible-gas comparisonKlein Tools

ET120 Combustible Gas Leak Detector

Role: Combustible gas

Research-based review

QUICK VERDICT

Our take

ET120 gives a flexible probe and two sensitivity settings for its documented combustible-gas role. Its indication belongs with the location and operating conditions, not an unsupported statement that all gas equipment is safe. Not personal protective equipment or a carbon-monoxide meter. Check the exact model, accessories and current instructions before purchase.

Best for

Inspectors whose agreed scope includes appropriate combustible-gas observations.

Skip it if

Not personal protective equipment or a carbon-monoxide meter.

Pros

Role: Combustible gas
Probe: 18-inch flexible gooseneck
Indication: LED and audible

Cons

Not personal protective equipment or a carbon-monoxide meter.
Confirm the complete retail package and required maintenance

MANUFACTURER SPECIFICATIONS

Key specs

RoleCombustible gas

Probe18-inch flexible gooseneck

IndicationLED and audible

Identify the gas and intended role

Combustible-gas, refrigerant and carbon-monoxide detection are different applications. Confirm the exact supported gas and operating environment for the instrument.

Understand indications and maintenance

Sensor condition, clean-air setup and prescribed checks influence indications. A tick rate is not a universal laboratory concentration measurement.

Prepare the reporting and response scope

Record an appropriate observation without certifying an entire gas installation. Suspected hazardous conditions require the applicable emergency response rather than continued investigation.

Sources and review method

Technical details were checked against manufacturer documentation. Recommendations reflect the documented features and their fit for the work.

This is a research-based review. We have not hands-on tested this product or independently measured its performance. How we choose tools →

Primary manufacturer source ↗

CHECK THE CURRENT OFFER

Klein Tools ET120 Combustible Gas Leak Detector

Confirm the exact model, kit contents and seller. The link may open a product search; prices and availability can change.

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QUESTIONS & ANSWERS

Frequently asked questions

Is a refrigerant detector automatically a gas detector?

No. Confirm the exact supported gases and permitted application.

Does no indication prove there are no leaks?

No. Access, operating conditions and instrument limitations affect what can be observed.

Was this tool independently field-tested?

No. This is a research-based buying assessment using manufacturer documentation, not a claim of hands-on testing or measured comparative performance.

Compare before you buy

See the comparisons in Best Combustible Gas Detectors for Home Inspectors: Defined Scope and Indications →

Home Inspector HVAC and Plumbing Observation Tool Kit: Accessible Conditions and Follow-Up →