My son is a HVAC tech and needed one of these so he quit borrowing everyone else's. It didn't come with any type of directions or manual, but he was able to figure it out on his own. The first thing you have to do is insert the battery (which it comes with, thankfully), so you remove the skin and use a coin to get the cover removed. He was able to turn it on, and use the toggles to test it with what seemed like good accuracy. He's excited he no longer has to borrow from the "big boys."
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