The Triplett MG430-NIST tests Insulation Resistance to 2000MΩ using three test voltages (250V, 500V, and 1000V), and also measures AC/DC Voltage and Low Resistance (Continuity). Additional features include a Lock Power function for hands-free operation, Data Hold to "freeze" the reading on the display, Backlit Dual LCD display, Auto power off, plus Low Battery and Overrange Indication. CAT III 1000V safety category. Includes Certificate of Traceability to N.I.S.T., test leads with alligator clip, (6) AA batteries, and carrying case. 1-year warranty.