Quote:
Originally Posted by Rusty
Used to use them at work.  They have to be set-up for the type of gas you are checking for. And for % of LEL. 
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Very true, but ... OP is not wanting to know an accurate level; he/she just wants to know where the gas smell is coming from. Any explosimeter should work well enough, for OP's purposes, straight out of the box with no adjustments/calibrating.