SMAKN 4 Bit voltage current meter DC0-33V/1A/3A Voltmeter ammeter RED+BLUE Measurement range: DC 0-999.9mA-3.000A(current); 0.00-33.00V(voltage) Display color: Red+BLUE Display mode: Dual 0.28" LED digital 4 bit tube Supply voltage: DC 3.5-28V; Measurement accuracy:  (0.3% + 2 digits) Powered by SMAKN Advanced Technology