The GT310 and GT320 measure AC/DC voltage, AC/DC current, resistance and capacitance, and checks diodes for continuity. They also performs non-contact AC voltage and current measurements. Both autoranging models wirelessly interface to a computer or to the optional RD330 remote monitor up to 33 ft. (10m) away. The GT310 features a large, backlit, 2-row, 7-segment LCD display. The GT320 features a dot matrix LCD display.