NRFSP Manager Practice Exam

A thermometer described as having a metal probe at the end of a wire connected to a digital display is a thermocouple. It works by using two dissimilar metals joined at the sensing tip; as temperature changes, a small voltage is generated along the wire, which the digital display measures and converts into a temperature reading. This probe-and-wire setup paired with a digital readout is the defining feature of thermocouples. Thermistors, while also used with probes, rely on resistance changes in a single material rather than the voltage generated by two metals. The other two options aren’t thermometer types at all or describe a safety temperature range, not a sensing device.