What meter is used to check the contact points on a de-energized heater relay?

When checking the contact points on a de-energized heater relay, an ohmmeter is the correct tool to use. This device measures electrical resistance in ohms, allowing technicians to determine whether the relay contacts are closed (continuity) or open (no connectivity) when the relay is not energized. By measuring resistance, the technician can assess the condition of the contacts and ensure they are functioning properly.

The use of an ohmmeter is crucial because it does not require the circuit to be live, thus making it safe to perform this measurement. In contrast, a voltmeter measures voltage and is not suitable for determining the state of contacts on a de-energized device. An ammeter measures current and can only be used when there is an active electrical flow, which is not applicable when evaluating a relay that is not powered. A hygrometer, which measures humidity, is unrelated to electrical measurements and is not relevant in this context.