Overload alarm function (overpower alarm threshold, backlight and power flashing alarm) Energy key reset function,Store data when shutting down Large screen LCD display (display voltage, current, active power, simultaneous energy) Electrical parameter measurement function (voltage, current, active power, energy) Technical Parameters Voltage measurement range: DC0.000~100.0V error 1.00V 0.1V starting Current measurement range: 0.000A~10.00A error 0.1A 0.03A starting point Power measurement range: 0.000~1000W Working energy consumption: 20mA (measured at DC12V) Voltage display fine-tuning: supported, 0.1V step Current display fine-tuning: supported, 0.1A step Low voltage audible alarm: supported, 0.1V ~ 99.9V High voltage audible alarm: support, 0.1V~100.0V Overcurrent audible alarm: supported, 0.1A~10.00A Screen on and off function: supported, only controls the digital tube and does not affect the circuit on and off Product size: 79.3x42.1x26.2mm Installation opening: 71.7x39.1mm Product weight: 40g (including wires) Material: ABS colour: Red Package Contents: 1 x Digital Voltmeter Ammeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.