Does this detect hydrogen sulfide?

you will have to call them. 1-800-553-4676. I was unable to find any info. methane, butane and propane and others* but that doesnt say H2S specifically.

Can it be used for car?

It will detect gasoline fumes but is not a carbon monoxide detector.

Will it work for r290 refrigerant?

Although I have never tried it on refrigerant. The unit is made to detect combustible gasses. As is stated in the specs.

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Combustible Gas Leak Detector

Product ID: 64279744

Details

Alarm
Audible
Brand
KLEIN TOOLS
Colour
Black and
Global Trade Identification Number
Item weight
13 Ounces
Material
Blend

📏Detection range 50-10,000 ppm

🔊85dB audible alert escalates with gas levels

🦾18-inch flexible gooseneck sensor reach

410780CFA

Duties & taxes included

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Description

🔥 Stay ahead of leaks with precision detection! 🚨

ERGONOMIC FLEXIBILITY - 18-inch flexible gooseneck extends sensor reach into tight or hard-to-access spaces, clipped conveniently for storage.
DUAL SENSITIVITY MODES - Switch between high and low sensitivity to tailor detection for any environment or task complexity.
CLEAR VISUAL AUDIBLE ALERTS - Five bright red LEDs plus an escalating 85dB alarm ensure you never miss a leak, even in noisy job sites.
INSTANT CALIBRATION CONFIDENCE - Automatic zero-point calibration on startup guarantees reliable readings every time you power up.
PRECISION DETECTION AT YOUR FINGERTIPS - Detects methane, propane & combustible gases from as low as 50 ppm to 10,000 ppm for unmatched safety assurance.

The Klein Tools ET120 Combustible Gas Leak Detector is a professional-grade handheld device designed for HVAC and safety experts. It detects methane, propane, and other combustible gases with a wide detection range of 50 to 10,000 ppm, featuring dual sensitivity modes and both visual and audible alarms. Its 18-inch flexible gooseneck sensor allows access to hard-to-reach areas, while automatic calibration ensures accuracy. Lightweight and portable, it’s a must-have tool for proactive gas leak detection and workplace safety.

Specifications

ASIN	B074NBJ8XP
Alarm	Audible
Best Sellers Rank	441,334 in DIY & Tools ( See Top 100 in DIY & Tools ) 13,405 in Measuring & Layout Tools
Brand	KLEIN TOOLS
Colour	Black and Orange
Country of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (1,808)
Global Trade Identification Number	00092644690648
Included Components	Tester, Batteries, Carrying Pouch
Item Dimensions D x W x H	4.5D x 6.9W x 71.9H centimetres
Item Length	28.31 Inches
Item Type Name	Combustible Gas Leak Detector
Item Weight	13 Ounces
Item Width	1.78 Inches
Manufacturer	Klein Tools
Manufacturer Warranty Description	Two years from date of purchase.
Material	Blend
Model Number	ET120
Number of Items	1
Operating Humidity	85 percent
Part Number	ET120
Power source	Battery Powered
Product Style	Combustible Gas
UPC	092644690648
Unit Count	1.0 count

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