The AEMC Model 6522 is a handheld, battery-powered digital insulation resistance tester capable of measuring up to 1000V. Designed for safety and durability, it features a CAT IV 600V rating and an IP54 enclosure. The instrument tests insulation resistance at 250V, 500V, and 1000V, with measurement ranges up to 40 GΩ. It includes a 700V AC/DC true RMS voltmeter, continuity testing with selectable test currents of 20mA or 200mA, a timer, and a lock function for hands-free operation. The large digital/analog display with a blue electroluminescent backlight provides clear readings. The tester complies with international standards such as IEC/EN 61557 and offers additional features like test lead resistance compensation, auto discharge after tests, hold function, and auto standby to conserve battery. It is ideal for electrical insulation testing and maintenance applications.