A peak-reading detector is a device that is used to measure the maximum amplitude or the highest peak of an electrical signal. It is an essential tool in many industries that work with signal processing, such as radio communication and audio engineering. There are several synonyms for peak-reading detectors, including peak detector, amplitude detector, envelope detector, and signal detector. Each of these terms has a slightly different nuance in terms of the specific function they perform. However, they all refer to instruments that measure the most significant amplitude level of a particular waveform and provide useful information to technicians and engineers who need to analyze, troubleshoot, or modify electrical signals.