The IR4056 is a 5-range, 50V to 1000V digital insulation resistance tester with bargraph, and delivers efficient functions and features to help shorten work time associated with field insulation testing.
 INSULATION TESTER IR4056 Key Features:
5-range testing voltage of 50 V/100 MΩ to 1000 V/4000 MΩ
Stable & high-speed digital readings, 0.8 second response time for PASS/ FAIL decisions
 Drop proof onto concrete from 1m (3.28 feet)
Bright LED, luminous LCD, test lead with bright LED lamp to illuminate near hand 
Continuity check via 200 mA testing
 Built in AC/DC voltage meter, useful for testing solar power generation systems and electric vehicles