The Megger BM21 is a high-performance, battery-powered 5 kV insulation resistance tester designed for the comprehensive testing of high-voltage electrical equipment. Engineered for reliability and simplicity, the Megger BM21 is a favorite among utility engineers and industrial maintenance teams for assessing the insulation integrity of transformers, large motors, generators, and high-voltage cables.

With selectable test voltages of 500 V, 1000 V, 2500 V, and 5000 V, the Megger BM21 offers the versatility needed for a wide range of applications. It features a clear, dual-scale analog/digital display that allows technicians to monitor real-time trends while benefiting from precise digital readings up to 5 TΩ. The instrument also includes a built-in guard terminal to eliminate the effects of surface leakage, ensuring that your measurements reflect the true state of the internal insulation.

Safety is a core priority for the Megger BM21, featuring an automatic discharge circuit and a warning system for live circuits. Its rugged, portable design and weather-resistant case make it ideal for use in challenging outdoor environments. Whether you are conducting routine maintenance or diagnosing critical faults, the Megger BM21 provides the professional-grade accuracy and durability required for modern power systems.