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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Description

🔥 Stay ahead of leaks with precision and power! 🛠️

INTUITIVE ALERTS - Five bright LEDs and a loud 85dB alarm keep you instantly informed of leaks.
DUAL SENSITIVITY MODES - Switch between high and low sensitivity to tailor detection to your environment.
SMART POWER MANAGEMENT - Auto shut-off after 10 minutes saves battery life so you’re always ready.
ERGONOMIC DURABLE DESIGN - Comfort grip with rugged build for demanding job sites and extended use.
PRECISION DETECTION AT SCALE - Detect combustible gases from 50 to 10,000 ppm for ultimate safety assurance.

The Klein Tools ET120 Gas Leak Detector offers professional-grade combustible gas detection with a broad 50-10,000 ppm range, adjustable sensitivity, and clear visual and audible alerts. Its 18-inch flexible gooseneck and ergonomic design make it ideal for precise, comfortable use in challenging environments. Battery-saving auto shut-off and included accessories ensure reliable, on-the-go safety monitoring.

Specifications

Brand	KLEIN TOOLS
Style	Combustible Gas
Power Source	Battery Powered
Color	Black
Product Dimensions	1.79"D x 2.71"W x 28.3"H
Item Weight	13 Ounces
Alarm	Audible
Operating Humidity	85 percent
Global Trade Identification Number	00092644690648
Number of Items	1
Manufacturer	Klein Tools
UPC	092644690648
Part Number	ET120
Item Weight	13 ounces
Item model number	ET120
Batteries	4 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Pattern	Detector
Item Package Quantity	1
Measurement System	Metric
Display Style	Digital
Special Features	Audible Alert, Auto-Power Off, Visual Notification
Included Components	Batteries, Carrying Pouch
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Description Pile	4 x AAA

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