A surge-crest ammeter is a device used to measure the electric current in a circuit. Synonyms for this type of ammeter include peak ammeter, crest meter, and peak-reading ammeter. All these terms refer to an instrument that measures the peak or crest voltage of an alternating current waveform. Other synonyms for surge-crest ammeter include peak voltage meter, peak detector, and peak-to-peak voltmeter. An ammeter is an essential tool for measuring current flow in a circuit and is used in a variety of industries, including electronics, automotive, and power generation. Regardless of the term used, a surge-crest ammeter is an invaluable tool for ensuring safe and efficient operation of electrical systems.