Hioki 4057-50 Insulation Tester is a compact, rugged digital insulation tester with 5 test voltage ranges (50V–1000V) and a high-resistance measurement up to 4000 MΩ. Designed for fast, accurate field testing, it features a bar graph display, built-in hard case, and test lead storage—ideal for electricians and maintenance professionals.

Applications: Electrical Wiring Inspections, HVAC System Checks, Solar and Renewable Energy Systems, Control Panel Testing