The Triplett MM300 AC/DC True-RMS Manual Ranging Digital Multimeter is a manual ranging 3-1/2 digit (2000 count) True-RMS compact digital multimeter. True-RMS provides better accuracy when measuring non-sinusoidal or noisy waveforms. The MM300 measures AC/DC Voltage, AC/DC Current, Resistance, Temperature, Battery Test (1.5V & 9V), Continuity and Diode Test. It features Data Hold, Auto power off, and a low battery indicator. With a CAT III 600V safety rating, the MM300 is well suited for a variety of commercial and residential applications such as security, home theater, electrical, HVAC installations and more.