Features: 1.Practical Use: For measuring AC voltage, current, active power, power factor, working frequency and electrical energy. 2.Clear Display: Equipped with LCD digital display, clear data viewing will greatly simplify your work. 3.Easy To Install: Designed with light weight and small size, you can quickly complete a simple installation. 4.High Accuracy: With wide measurement range and high accuracy, it is easy to measure and achieve better control. 5.Multifunction: Also with memory function and high testing efficiency, this power monitor is very easy to operate. specification:Item Type: AC Meter Material: ABS Measurement Accuracy:1%2 Words Measurement Range: AC Voltage: AC80.0-300.0V Or AC200.0-450.0V True Rms Measurement AC Current: AC 0-99.99A, Current Display Resolution 0.01A, More Than 100A Display 100.0A Frequency: 45.Hz-65.0Hz Power Factor: 0.00-1.00PF Measurement Speed: 2 Times Per Second Product Size: Approx.70 x 39 x 40mm / 2.8 x 1.5 x 1.6in PackageList: 1 x Power Monitor 1 x User Manual Note1. The voltage input (green) terminal and the current transformer secondary input (blue) terminal must not be wired wrongly, otherwise the instrument will be damaged! 2. This instrument 200?450V s, inverter output as well as the correction of the positive metaphorical circuit on the measurement, otherwise the instrument will be damaged! 3. Remember not to squeeze the LCD screen during the installation of the instrument, otherwise there will be a messy code, broken code situation! 4. If you buy more than one instrument, the transformer can not be used interchangeably! (Because the instrument and the transformer is a pair of calibration) in order to avoid affecting the measurement accuracy.