Varistor Testing

Try a continuity test on the device. A healthy varistor should have a fairly strong resistance. At least stronger than a regular old fuse.

You won't get a beeping noise. If you have an in-rush current limiter type resistor,, the resistance will definitely drop as the heat rises. Just keep that in mind.
The most common method of testing a varistor is resistance or voltage measurement. In this type of test, the varistor is placed in a circuit and the resistance or voltage is measured across it. This can be done using a digital multimeter. The results of the test can then be used to help determine the varistor’s characteristics, such as its clamping voltage and rated current.
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