Features: 1.Highly 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. 2.Dual 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. 3.Easy 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. 4.Resistant 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. 5.Widely Used: The voltmeter amperometer can be used in cars, motorcycles, electric bicycles, etc. for monitoring batteries, voltage and current change status or other equipment. Specification: Item Type: Volt Amp Meter Material: ABS Test Voltage Range: Range: 600V, Test Range (V): 0.0-600V, Resolution (V): 1V, Resistance ()>2M Test Current Range: Range 20A, Test Range (A):0.10-20A, Resolution (A): 0.1A Size: Approx. 70 x 40 x 30mm / 2.76 x 1.57 x 1.18in Installation Hole Diameter: Approx. 68 x 38mm / 2.68 x 1.5in Measurement Accuracy: 1% ( 2 Bits) Measurement Rate: 500mS/Time Zeroing Calibration: In order to obtain more accurate measurement, it is recommended to power on preheat for more than 5 minutes before zeroing calibration. Working Environment: Please try not to install the meter head and current transformer around high temperature, strong magnetic field and large transformer, otherwise it will affect the accuracy. Working Current: Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.