Ruby Electronics DT-6605 Digital Insulation Tester MegOhmMeter CAT IV 5000V 60 Giga Ohm Meter Wide range measurements from 500V to 5000V and up to 60 Giga Ohm Meets IEC61010-1, CAT IV 600V safety standard Large 6000 counts digital display with bargraph and backlight Polarization index measurement (PI) Auto ranging & timer measurement function