The Triplett MG530-NIST with Certificate of Traceability to N.I.S.T. tests Insulation Resistance to 4000MΩ using 4-test voltages (125V, 250V, 500V, and 1000V), and also measures AC/DC Voltage, Resistance, Frequency, and Continuity. Additional features include a Lock Power function for hands-free operation, Min/Max Hold records highest and lowest readings, Data Hold to "freeze" the reading on the display, and a backlit 4000 count LCD display with bargraph. In addition, it has a LoZ (impedance) mode for identifying ghost voltages and LPF (low pass filter) mode for filtering frequency and harmonic interference when measuring variable frequency drives, Auto Power off with disable, Low voltage indicator, and a CAT IV 600V safety rating. Includes test leads, (6) AA batteries, carrying case and Certificate of Traceability to N.I.S.T. 1-year warranty.