4-wire, 3-wire, and 2-wire testing AC Earth Voltage Overrange and low battery indication Large dual line LCD Automatic I (current) and P (potential) spike check Test Hold function for easy operation Autoranging, Automatic Zero adjustment, Data Hold and Auto Power off Specifications Earthground Ranges 2?/20?/ 200?/2000? Test Current/Frequency 2mA / 820Hz AC Earth Voltage/Frequency 0 to 300VAC / 40 to 500Hz Resolution 0.01?/ 0.1?/1?/0.01k? Accuracy "(2%rdg+3d) Weight 3.15lbs (1430g) Power supply Eight 1.5V 'AA' Batteries Dimensions 9.8 x 7.8 x 4.3in (250 x 190 x 110mm) Basic Accuracy "(2%rdg+3d) Items Included test leads with alligator clips 4 auxiliary earth bars hard carrying case eight 1.5V AA batteries