I bought this to check the hydrogen level in a battery storage tank (24 x 2V 800Ah traction lead acid batteries) in my solar system. They gas well under charge. Wanted to make sure my ventilation system is adequate. Seems to be working fine. Tested with butane from a lighter. Turns out it works. I then re-zeroed the battery box and checked that it was between 160 and 320ppm depending on how close it was to the batteries. Since batteries emit hydrogen and hydrogen sulfide, I'm not sure which, but both are a problem, so they're worth testing. Very happy with my purchase.
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