E-MILLIOHM bonding tester is a specialized electrical testing device used to measure very low electrical resistance, typically in the milliohm (mΩ) range. It is commonly used in applications where ensuring a strong electrical bond or connection is critical, such as in grounding systems, electrical wiring, and bonding of metal components in various industrial, automotive, and aerospace environments.

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Key Uses:
1. **Grounding and Bonding**: Ensures low-resistance connections between different components to avoid voltage differences that could lead to safety hazards, like electrical shock or fire.

2. **Quality Control**: Verifies that wiring, connectors, and metal joints meet required resistance standards, ensuring the electrical integrity of the system.
3. **Automotive and Aerospace**: Tests electrical bonding between metal surfaces, which is essential for maintaining the functionality of electrical systems and preventing electromagnetic interference.

Milliohm bonding testers typically use a four-wire (Kelvin) measurement method, which reduces the effects of lead resistance and gives a more accurate reading of the actual bond resistance.