The TRIPLETT MG530 tests Insulation Resistance to 4000MΩ using 4 test voltages (125-Volt, 250-Volt, 500-Volt and 1000-Volt) 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 and carrying case. 1-year warranty.