Digital Meg-Ohm Meter Hioki IR4056-20 Digital Insulation Resistance Tester Digital Meg-Ohm Meter (replaces 3453) 5-range testing voltage 50 V/100 M¦¸ to 1000 V/4000 M¦¸ Stable & medium-speed digital readings response time at PASS/ FAIL decision 0.8 second Drop proof onto concrete from 1m (3.28 feet)