RUIDENG 0-33V 0-3A Four Bit Voltage Current Meter DC Double Digital LED Display Voltmeter Ammeter

This is the cheap version, the current range is unchangeable.
If you want higher version, please click this one: 1059961

Feature:
 
Weight: 21g
Display color:  A: Red+Red
                    B: Red+Blue
                    C: 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)
Supply voltage: 3.5-28V
Lead wire length: 14 cm(Five wires)
Measurement range: DC0.00-33.00V(voltage, Resolution 0.01v )    
                                       0.000-3.000A(current, Resolution 0.001A)
Operation temperature: -10 degrees~65 degrees
Current measurement accuracy: ± (0.3% + 2words)
 
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 + (0-99.9V)
Red thick wire (I+): Current input + (connect with load negative)
Black thin wire(I-): Current input - (in series in power supply negative)