Question

in the electrical field, what specialty tool is used to determine the polarity of electrical devices? a non - contact inductive tester a plug tester an infrared thermometer a metering device

Explanation:

The provided text explicitly states that a plug tester is used to determine the polarity of electrical devices, while the other tools serve different purposes: non-contact inductive testers find live wires, infrared thermometers measure component temperature, and metering devices identify general electrical properties.

Answer:

a plug tester