The AUTO ISO-1000C with Test Adapter is a clamp multimeter designed by Sonel, which complies with CAT III 300V safety standards. It is used to measure AC and DC current, as well as frequency, circuit resistance, capacitance, total harmonic distortion, power factor, and NCV. It has an automatic power-off function, data hold, auto-ranging, large LCD screen with backlit display, low battery display, resistance measurement at different speeds, and a reversible test adapter. This multimeter is also equipped with overload protection, and a low-battery indicator to let the user know when it is time to replace the batteries.