Cambridge digital multi-meter measures DC and AC voltage, DC Current, resistance, and diode. DC voltage maximum allowable input voltage 300 Volts; AC voltage maximum allowable input voltage 300 Volts; DC current maximum allowable input current 10 AMP for >2 AMP; Resistance maximum open circuit voltage about 1 Volt. Meter features low battery indication and full range overload protection. 3 1/2 digit LCD, max reading of 1999; 9 Volt battery included. Cambridge performance driven and high quality products are preferred by industry leaders.