A digital multimeter is a useful tool for electricity work. There are numerous models that you can buy, one popular make is the fluke. The meter can be used to measure electricity, current, and resistance. Although there are many uses, I generally use the multimeter to check if there are live electricity in the circuit I'm working on. Below is an image of a digital multimeter courtesy of wiki. I use multimeter that is less sophisticated than the one shown, mainly because of the price, and the features I need for home repairs. These meters can cost from 30 dollars to 6000 dollars Canadian.
NOTE: ALWAYS ASSUME THE CIRCUIT IS ELECTRICALLY POWERED. NEVER TOUCH THE WIRES WITHOUT CHECKING FOR EXISTENCE OF POWER.
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