Features: Fixed: the transformer is fixed on the instrument. AC voltage, ammeter same screen, double color, double display, highlight large font. Simple connection of instrument:Two-wire system: no additional power supply, red and black wire connected to measure the voltage at the same time to the meter head power supply (no polarity). Current testing requires no additional purchase of transformer, instrument with a high accuracy transformer. In the watch head l set fine-tuning potentiometer, it can calibrate the voltage and current error by itself. Specification: Measurement accuracy:1% ± 2 digits Display: 0.39 inches LED digital tube display, voltage _ red, current _ green Measurement speed: about 2 times per second Dimensions: Approx. 70 * 40 * 40 mm / 2.8 x 1.6 x 1.6in Installation Dimensions: Approx. 68 * 38 mm / 2.7 x 1.5in Power supply line, measuring line length: about 150mm / 5.9in "split" transformer lead length: about 100mm / 3.9in 40/5000 Operating temperature: -10 ~ + 50 ℃ Working humidity:10 ~ 80% (without condensation) Working pressure:80 ~ 106 kPa Sunlight exposure: no direct exposure Voltage Range:AC 60~500V Resolution:1V Current Range:AC 0~50A Resolution:1A Package List: 1*Fixed A/V Meter Note: 1. The wiring sequence of the instrument is: the circuit of the current loop is connected first, the 220V voltage is finally connected, and after the 220V power supply is connected, no parts and circuits behind the instrument can be touched to prevent the danger of electric shock. 2. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Dual color and display: YB4835VA digital display AC voltmeter adopts AC voltage, the current meter is on the same screen, dual color, dual display, highlight and large font No need for additional power supply: LED AC ammeter adopts a two-wire system, the wiring is simple, no additional power supply is required, the red and black wires are connected to the meter power supply at the same time (no polarity) Equipped with transformer: LED AC ammeter does not need to purchase an additional transformer, the instrument is equipped with a high-precision transformer. A trimming potentiometer is set in the meter head to calibrate the voltage and current error by itself. Easy to use: There is a back cover on the head of the split transformer. The transformer can be fixed on the instrument. AC digital voltmeter is safer, more convenient and more reliable to use. Size: YB4835VA digital display AC voltmeter measurement accuracy is 1%±2 digits, LED AC ammeter size is about 70 x 40 x 40 mm/2.8 x 1.6 x 1.6 inches, installation size is about 68 x 38 mm/2.7 x 1.5 inches