Measurement accuracy: 0.01+2 words Display: Voltage display: 0.39" red 4-bit LED digital tube, Current display: 0.39" solid green 4-bit LED digital tube measure : AC voltage: AC80-300V (single phase) AC current: AC0-100.0A, current display resolution 0.01A when measured current is less than 10A, current display resolution 0.1A when measured current is greater than 10A. 10A display resolution of 0.1A, automatic range conversion (decimal point automatically shifted) true RMS measurement Power consumption: 0.2VA 5. measurement speed: approximately 2 times per second Dimension: 79(L)*43(W/H)*48mm(thickness) Fitting size: 76*39mm (flush mount) This instrument is only suitable for AC 50-60HZ pure mains power supply, it cannot be used for square wave, inverter output and measurement on the sine wave circuit of the modified sine wave, otherwise the instrument will be permanently damaged. Note: The transformer is separated from the instrument, the transformer can be installed according to the actual measurement position. (That is, the wire can be arbitrarily extended to the ideal position of the installed equipment) See the main picture of the baby description for details. The external transformer (hole diameter 15.5mm) can meet the national standard 21-25 square (mm) standard copper wire through. Note: If you are at home: (C45/DZ47) air switch in the total line pressed to change the instrument, you can real-time monitor the current grid voltage and load current, current * voltage = power (so you can also calculate the current power of all appliances in your home, i.e., how many W. This makes it easy to check for a high current display when you're on the go, so you don't forget to shut down the operation of some high-power devices and waste electricity bills and resources. We only sell the current and voltage meters, not other items on the listing. photo. Due to differences between monitors, the picture may not reflect the actual color of the item. Please allow for small errors in size due to measurements manual. Please allow for minor dimensional errors due to to manual measurements.