An electrician was working on a machine but didn't have his meter with him. An engineed was near by and the electrician borrowed his meter (it was a Fluke) to check some fuses. He gave the meter back and a few minutes later the engineer made a voltage test and the meter blew up in his hands. The engineer did not check but the electrician gave the meter back and it was still set on ohms. Meters made today are more forgiving of this mistake but you should always double check your meter to make sure of the settings and that the leads are pulgged in to the proper place for what you are doing. You don't have to make a mistake to have something blow up in your face. You could just be in the wrong place at the wrong time. Wear your PPE. 

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