Electrical TestersElectrical testers are tools that are used to measure, diagnose, or verify the electrical characteristics of a circuit or device. They are commonly used by electricians, maintenance workers, and other professionals who work with electrical systems. Electrical testers can be used to measure a wide range of electrical quantities, including voltage, current, resistance, continuity, and capacitance. They may also have additional features, such as the ability to test for the presence of AC or DC voltage, or to measure the frequency or phase of a signal. Electrical testers are available in a variety of forms, including handheld meters, probes, or clamps, and can be purchased from electrical supply stores or online retailers.