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How to use a multimeter Make sure you are familiar with the instructions provided on the packing before getting started. Once you are ready, turn on the multimeter and turn the selector knob to either DC or AC and match it to what type of current you are testing for. Next, place the red probe onto the positive terminal and the black probe on the negative terminal. Soon after your meter should start displaying numbers to let you know the levels of the component it’s testing.
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