A technician is only as accurate as the measurement equipment they are using. If the equipment is used incorrectly or is faulty, then the measurements will be inaccurate. If the measurements are inaccurate, then the technician will draw the wrong conclusions. To avoid getting inaccurate readings, you need to handle, use, and store meters properly. When you are done using a multimeter, it should always be turned off to extend battery life.
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MultiMeters 101: Basic Operation, Care and Maintenance and Advanced Troubleshooting for the Skilled Trades – Simple Book Publishing