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The first step in reading your electrical tester is to determine what type of circuit you are testing and set the meter accordingly. Next you determine the suspected range of the circuit you are testing and set your meter to at least ten times that amount. The red wire is then connected to the positive connection and the black wire is connected to the negative or ground connection. You then read the number from the scale you are working with. For example, the red scale is for AC (houses) and the black scale is for DC currents (car, boat, or RV) Finally, you read the resistance by determining the Ohm reading on the very top scale of black numbers. The amps are determined the same way as voltage.

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