The HT79 clamp is designed primarily for the measurement of AC and DC leakage currents and measurement of currents up to 10A (DC) and 20A (AC) in reaching CAT IV 300V according to IEC / EN61010-1. Other measures envisaged are the AC / DC Voltage, Resistance and Continuity Test measurement. The instrument has a 5000-point display, display backlight, auto-off function to preserve its internal battery. HT79 can clamp a conductor with a maximum size of 23mm. Other important functions present are the MIN / MAX for the detection of the Maximum and Minimum value of the quantities, the Data HOLD function and the ZERO function for the execution of preliminary zeroing of the currents.