Ohmmeters are an electronic device that measure electrical resistance, and come with different levels of sensitivity. Some are designed to measure low-resistance materials, while others measure higher resistance. The higher resistance the material has, the less current will pass through it.
An ohmmeter is typically not used to measure resistance across an entire circuit, but rather through various parts of the circuit, although it can be used to test that a circuit is not broken.
With results within 0.05%, the AEMC 6250 10A Micro-Ohmmeter utilizing a four-lead Kelvin method, and features a four-input, manual-ranging meter with seven test current/resistance ranges for precise, low-resistance measurements from 0.1 microohm (μΩ) to 2,500 ohms (Ω) of inductive samples such as:
When verifying grounding resistance, a clamp-on tester makes it simple by simply clamping the sensor around the connection at the ground rod, and reading the resistance on the display of the instrument.