Which meter is used to check the contact points of a sequencer on a live heater?

A voltmeter is the appropriate tool for checking the contact points of a sequencer on a live heater. When troubleshooting or assessing the operation of electrical components, such as sequencers, it’s essential to measure the voltage present at the contact points to determine if power is being correctly supplied to the heating elements.

In the case of a sequencer, it regulates the operation of multiple heating elements; therefore, ensuring that voltage is present at these points confirms that the control system is functioning correctly. A voltmeter is specifically designed to measure electrical potential difference (voltage) without altering the circuit, which is crucial in a live electrical system where safety and accuracy are priorities.

Using a multimeter could also work, as it often includes a voltmeter function, but the specific mention of a voltmeter makes it clear and directly relevant to the voltages being checked. Other tools like an ammeter or an ohmmeter serve different purposes; an ammeter measures current (not voltage), and an ohmmeter checks resistance, which are not suitable for assessing the operational status of a sequencer's contact points when the system is live.