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today you will see Digital multimeter
What is Digital Multimeter ?

A digital multimeter is a test tool used to measure two or more electrical values

How is a digital multimeter used?
Measuring voltage is one of the easiest measurements to make using a DMM. Place the probes across the two points where you want to measure the voltage. Virtually all DMMs have an auto-polarity function, so there is usually no need to worry about how the probes connect.

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