Large display with backlight Insulation test (1587: 0.01 Mohm to 2 Gohm), (1577: 0.1 Mohm to 600 Mohm) Insulation test voltages (1587: 50 V, 100 V, 250 V, 500 V, 1000 V), (1577: 500 V, 1000 V) Live circuit detection prevents insulation test if voltage> 30 V is detected for added user protection Auto-discharge of capacitive voltage for added user protection AC/DC voltage, DC milliVolts, AC/DC milliamps, Resistance (W), Continuity Auto power off to save battery power CAT III 1000 V, CAT IV 600 V measurement category Accepts optional Fluke TPAK magnetic hanging system to free your hands for other work Rugged, utility hard case allows you to bring everything you need for the job 3-year warranty