There are many reasons why a portable gas detector may not react to gas, some of which are not visibly evident to the user.  When an instrument is turned on, you can see that the battery and display are working properly, but what about the internal electronics which play a critical role in protection? Do the sensors and alarms all work, have they been inhibited by using the wrong cleaning solution or have their openings become obstructed by mud? How do you know?

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