Amprobe AMB-3 Electrical Insulation Resistance Tester

The Amprobe AMB-3 Insulation Resistance Tester is a compact, battery-powered handheld meter that quickly assesses insulation health on electrical equipment and lines, including wires, cables, transformers, and motors. It uses a 500 V DC test voltage and measures insulation resistance from 0 Ω up to 1,000 MΩ, enabling electricians to detect degraded insulation before energizing gear. A built-in voltmeter reads up to 600 V AC on the measurement display, and a Battery OK test helps verify the unit is ready for use. The analog, mirror-scale indicator provides a quick, at-a-glance reading, and the device automatically discharges equipment capacitance for safe removal of test leads. The AMB-3 ships with test leads, a carrying case, and installed batteries for immediate field use. Designed to reduce downtime and lower shock risk, this tester delivers a simple, reliable check of insulation integrity for wires, cables, transformers, and electrical motors in maintenance and installation work.