HYD2420 LPG  Hydrogen Sulfide Tester H2S  is a specialized device used to measure the concentration of hydrogen sulfide gas in liquefied petroleum gas, which is commonly used as a fuel for heating, cooking, and various industrial applications. Monitoring H2S levels in LPG is crucial because hydrogen sulfide is a toxic and potentially deadly gas that can pose serious health and safety risks if present in high concentrations. For the detection of hydrogen sulfide in liquefied petroleum (LP) gases. The sensitivity of the test is about 4 mg/m3 (0.15 to 0.2 grain of hydrogen sulfide per 100 ft3) of gas.