Our company has purchased several of these Extech detectors. They work fine, they detect gas. So they do what they have to. But they're cheap, and we've had to repair the plastic case more than once. One problem we encountered when using two detectors is the need to adjust the internal potentiometer. One fine day the detection signal simply turns on and reports the presence of gas even though there is none. So we opened the device and set the pot, after that they work normally again. But it works and is very cheap.
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