today you will see Digital multimeter br What is Digital Multimeter ?br br A digital multimeter is a test tool used to measure two or more electrical valuesbr br How is a digital multimeter used?br 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.