This devise precisely measures area noise and other sound levels. You can then use an equalizer to fine-tune your PA or stereo system"s audio response to match the acoustic environment. Special features, such as the bar graph display and data hold, ensure pinpoint accuracy. Wide range sound capture measures 50-126dB SPL in 7 ranges. 1/4" phono jack for connection to your PA system, stereo or test equipment. Low battery, mode and status lights. Tripod mounting socket.