The Triplett MM300-NIST 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. It 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. Includes Certificate of Traceability to N.I.S.T., test leads and (3) AAA batteries. 1-year warranty.