1Highly Accurate Measurement: With Hall sensor, you can test positive and reverse currents with through hole design, without destroying the existing lines, and with calibrated potentiometer for self adjustment. 2Dual Digital Display: The meter is compact and can display real time voltage and current values on the same screen at the same time. With superb Smt technology, reliable to use. 3Easy and Safe Operation: Current can be detected by passing the wire directly through the hole. You can measure the current of the positive pole, negative pole, a certain line or equipment in the line at will. 4Resistant to Current Shocks: The volt amp meter can test the voltage or current of two completely isolated devices, and the ammeter will not be damaged by current shocks. The withstand voltage between the ammeter and the wire under test is up to 2KV. 5Widely Used: The voltmeter amperometer can be used in cars, motorcycles, electric bicycles, etc. for monitoring batteries, voltage and current change status or other equipment.