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)<br><br>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<br><br>Package Contents: 1 x Digital Voltmeter Ammeter<br><br>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.