Features: Electrical parameters measurement: AC voltage, current, active power, frequency, power factor, electrical energy;six in one. Power zero-clearing mode: key zero-clearing, automatic zero-clearing. Display type: LCD display, blue back;One screen multi-display, "7 kinds of display modes" is optional. Blue backlight brightness adjustable: high light, low light, not bright. The built-in button of the watch head can calibrate the voltage, current error and other options by itself. Display value update speed optional: fast, standard, slow, suitable for different working environment. Display accuracy can be set:3-bit,4-bit;Applicable to different requirements, power-down data storage function. The AC voltage, current, power and electric energy are all designed by automatic shift of decimal point. Instrument with a back cover, more safe to use, more convenient, more secure. Simple connection of instrument: no need to connect the power supply.Current testing requires no additional purchase of transformer or shunt. Specification: Wroking Temperature:-10~50 Working Humidity:10~80% Working Air Pressure:80~106kPa No Direct Sunlight Package List: 1*Multi-funtion Meter Note: 1.As different computers display colors differently, the color of the actual item may vary slightly from the above images. 2.The middle two terminals are the input and the left and right terminals are the output. 3.Do not use when there is high frequency voltage. Manual: Mode Button:For each click, switch the display mode of the variable display area: Only show frequency Hz _ only show power factor PF _ only show power kWh-power factor PF, frequency Hz cycle display-power factor PF, power kWh cycle display-frequency Hz, power kWh frequency Hz, power factor PF, power KWh _ cycle length according Hold the button to enter the setting mode or confirm exit. Set Button:For each click, switch the brightness of a backlight: highlight, low light, no light setting mode, Each click, the number adds one or switch the corresponding option Long press cancel settings or exit. Main Menu Setting Option 1-CU Calibrate Voltage Error 2-CA Calibrate Current Error 3-SP Setting Refresh Rate F:Quick S:Standard L:Low 4-En Power Setting Acc:Continous Automatic Adding Up REA: Power off and power on, when the output connected to the load and generated electricity, the electric energy flash zero and re-accumulation;If there is no load, do not clear the zero CLE: Manual power clearing F-dS Display Digit Setting 3:Voltage Current Frequency Power Factor 3 Digits 4:Voltage Current Frequency Power Factor 4 Digits H-rS Recovery of ex-factory value N:No operation Y:All settings restored to factory value