This meter is a 3 1/2-digit digital panel meter which can be used to measure AC voltage, frequency of AC Voltage, or AC current. You can select the desired measurement function with the key. In conjunction with a current transformer, this meter can be used to monitor large current. This meter can be used in the place where the power supply need to be monitored at all time; for example, it can be used with distribution board, generator, and more. It features easy reading, antivibration, electromagnetism-proof ability.