Both magnetic induction thickness gauges and eddy current thickness gauges are used to measure film thickness, but they use different methods. The magnetic induction coating thickness tester is used to measure the thickness of the non-magnetic coating on the magnetic substrate, while the eddy current coating thickness tester is used to measure the thickness of the conductive coating on the non-conductive substrate.

Coating thickness gauge: magnetic induction VS eddy current

Different working principle
Magnetic induction coating thickness tester uses magnetic induction principle to measure the thickness of non-magnetic coating on magnetic substrate. The thickness gauge consists of a probe containing a coil and a permanent magnet. When the probe is placed on the coating, an alternating current is passed through the coil, which creates a magnetic field that induces eddy currents in the substrate. The vortex generates its own magnetic field, opposite that of the probe. The strength of the magnetic field generated by the probe decreases as the distance between the probe and the substrate increases, and the thickness meter measures this decrease in magnetic field strength to determine the thickness of the coating.

Eddy current coating thickness tester measures the thickness of conductive coating on a non-conductive substrate based on the principle of conductivity. The thickness tester consists of a probe containing two electrodes. When the probe is placed on the coating, a small alternating current is passed through the electrode.

Coating thickness gauge: magnetic induction VS eddy current

Advantages and disadvantages
Both types of thickness gauges have their own advantages and disadvantages. Magnetic induction coating thickness gauges are usually faster and easier to use because they do not require the coating to conduct electricity. However, they may be less accurate than eddy current coating thickness gauges, especially for very thin coatings or coatings with low conductivity. In addition, magnetic induction coating thickness gauges may not be suitable for non-magnetic substrates because there is no magnetic field to measure.

Eddy current coating thickness gauges, on the other hand, can provide more accurate measurements of conductive coatings, especially those with high conductivity. However, they may require longer measurement times because the probe needs to establish stable electrical contact with the coating. In addition, eddy current coating thickness gauges may not be suitable for non-conductive coatings because there is no conductivity to measure.

In summary, the choice between a magnetic induction coating thickness gauge and an eddy current coating thickness gauge depends on the specific application and the characteristics of the coating and substrate under test. Other factors to consider when choosing a coating thickness meter include the desired accuracy, the thickness range to be measured, the size and shape of the substrate, and the environment in which the measurements are made. Some thickness gauges may be better suited for field use, while others may be better suited for laboratory use. It is also important to consider the cost of the meter and any necessary calibration or maintenance costs. In general, magnetic induction coating thickness gauges tend to be less expensive than eddy current coating thickness gauges, but this may vary by specific model and manufacturer. Magnetic induction coating thickness gauge and current coating thickness gauge are valuable tools for measuring film thickness. The choice between the two thickness gauges depends on the specific application and the characteristics of the coating and substrate under test. When choosing a thickness gauge, it is important to consider factors such as accuracy, range, substrate type and cost, as well as any necessary calibration or maintenance requirements.