Features: Measurement of electrical parameters: AC voltage/ current/ active power/ frequency/ power factor/ energy,6 in 1. Power zero-clearing mode: key zero-clearing, automatic zero-clearing. Display Type: LCD display, blue backlight;-Multi-screen display, "7 kinds of display modes" optional. Blue backlight brightness adjustable: highlight, low light, not bright. The voltage, current error and other options can be calibrated by the button itself. Displays updated values for different working environments. display accuracy can be set:3-bit,4-bit; applicable to different requirementspower down data saving function. The AC voltage, current, power and electric energy are all designed by automatic shift of decimal point has the functions of voltage, current, power upper and lower limit alarm and timeout alarm, besides the buzzer alarm, there is the optical coupling alarm output control function. Specification: Measurement range ACV130-500V; ACA0-100A Resolution When the voltage is less than 100V, the resolution is 0.01 V; when the voltage is greater than 100V, the resolution is 0.1V The resolution of current less than 10A is 0.001 A;Over 10A, the resolution is 0.01 A Measurement accuracy 0.5% 2 digits Measurement speed about 2 times per second Active power 0-9999 KW Frequency 45.00-65.00 Hz Power Factor 0.000-1.000 Power 0.000-9999 KWh Operating temperature -10 ~ + 50 Working humidity 10 ~ 80% (without condensation) Working pressure 80 ~ 106 kPa Package List: 1 * Multi-function intelligent watch head 1 * Mutual inductance coil Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images. Operation Setting Manual: Code Nmae Description 1-CU Calibrate Voltage Calibration voltage error 2-CA Calivrate Current Calibration current error 3-SP Display Speed S: Standard speed update display value L: Slow update display value F: Fast update display value 4-En Power Option REA: Resumption After the power, if there is no electricity generation, will always show the power before the power supply accumulated;When the power generation, the display screen flash two times, before the power cut down the accumulated energy value will be automatically zero, and from the beginning of the accumulation; CLE: Accumulated electric power manual zero clearing ACC: After the power on, the accumulated electric energy value will not automatically clear the zero, has been accumulated 5-ty Alarm Type S: Semi-automatic, as long as the alarm start, regardless of the value after the start of no change, will always alarm, unless someone for any key to remove the alarm will stop A: Full automatic, when the alarm start-up value back within the scope, will automatically remove the alarm 6-oU Over Voltage Value Set voltage alarm upper limit 7-LU Voltage Floor Set Voltage Alarm Lower Limit 8-oA