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Sound meter "W-52" was produced since 1952. Sound level meters are used to measure all kinds of noise characteristics. Sound meter "W-52" is a stand-alone portable device that allows you to measure sound intensity levels in dB over wide limits. It consists of a high-quality microphone, a broadband amplifier, a sensitivity switch that changes the gain in 10 dB steps, a frequency response switch and a dial gauge whose scale is calibrated directly in decibels. On the front panel, in addition to the main controls, there are sockets that allow additional devices to be connected to the circuit. Other information on the device yet.