Technical Parameters: Weight: 22g Display color: Red+Green Display mode: Dual 0.28 LED digital 4 bit tube update rate: About 200 ms/time Physical size: 48 x 29 x 26 mm (L*W* H) Opening size: 45 x 26 mm (L*W) Supplyvoltage: 3.5-28V Lead wire length: 14 cm(Five wires) Measurement range: DC 0-999.9mA-3.000A(current)0.00-33.00V(voltage) Operation temperature: -10 degrees~65 degrees Measurement accuracy: ± (0.3% + 2words) Display description: The above digital tube display voltage; there are four fixed display precision. the measurement range is 0.00-33.00V; the minimum resolution is 10mV The below digital tube display current; there are four fixed display precision; the measurement range is 0-999.9mA-3.000A. When the measuring current is below 1A it display ***.*mAthe resolusion is 0.1mA; When the measuring current is higher than 1A it display *.***Athe resolusion is 1mA; Instruction of wiring Red thin wire (VCC):Power input+ 3.5-28V(NOTE: If the measuring signal is lower than 28V and have abundant power supply it can be used as power supply for the module [black wire and yellow wire are contacted together to use]) Black thin wire(GND):Power input- Measurement signal - 3.5-28V Yellow thin wire (VIN):Measurement signal+ (0-33.00V) Red thick wire (I+):Current input+ (in series in power supply positive) Black thin wire(I-):Currentinput-(in series in power supply negative)