An ohmmeter is an electrical instrument that measures electrical resistance. Micro-ohmmeters (microhmmeter) are used to make low resistance measurements. Megohmmeters (megaohmmeter or in the case of a trademarked device Megger) measure large values of resistance. The unit of measurement for resistance is ohms (Ω).
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The 10A Micro-Ohmmeter, the AEMC 6250 is a rugged, low resistance tester designed for both plant maintenance and field use. Utilizing a four-lead Kelvin method, the AEMC 6250 is the most accurate Micro-Ohmmeter available, with results within 0.05%.
The Megger 210415 15kV Analog Megohmeter is an analog meter that measures insulation resistance to help reduce shock hazards and downtime on electrical systems that include wires, cables, transformers, and electrical motors.