Fangrui Product Details Movable Part: Movable Coil Type The Meter Placement Position: Vertical Wire: 2 X 200mm#28 Wires, One Black And One Red. They Are Used To Solder Led Positive/negative Poles. Of The Wire Needs 5mm Of Copper To Be Exposed For Easy Soldering. Backlight Type 1: Two Led Are Connected In Series 6v, 20ma, Connected To A Resistor, 620ohm1/2w Type 2: Two Led In Series 6v, 20ma, Connect A Resistor, 1.3kohm1/2w Electrical Performance: Standard Test Conditions: Temperature 20 Degree, Humidity . If There Is No Difference In The Test Results, It Can Also Be Carried Out In A Normal Temperature And Humidity Environment. 1 Current Sensitivity: The Direct Current Required For The Pointer To Be At The Zero Scale To The Position Shown On The Scale Plate. 2 Maximum Current Sensitivity: 200ua Of The Dc Current Required By The Pointer At The Zero Scale To The Full Scale Position Of The Scale. 3 Internal Dc Impedance: 750ohm . 4 Insulation Resistance: Test Its Insulation Value With A 500v Dc Voltage, And The Insulati