Measurement range and warning sign: decibel meter measuring 30 to 130 dBA, accuracy: 1.5 dB, resolution: 0.1 dB. Warning flashing backlight when the sound exceeds the set threshold value or measurement range. Multi-function dB meter: to calculate the sound level around you and take action in time to protect your hearing , great for music recording, noise pollution monitoring, home theater setup, noise complaints from neighbors, office and factory More Features: This level meter audible with large backlit LCD display sets an alert value when you exceed your setting, actual max/min reading, data hold function, manual/auto shut-off and battery indication < p>Easy to use: The digital noise meter is calibrated by a standard 94 dB source from the factory. Simply turn on the sound level tester and get an immediate reading in dBA, easy to use Multi-application: the noise detector with non-slip handle is widely used in factories, transport roads, systems audio, noise complaints from neighbours, sound quality control at home, at school and on construction sites. Compact and lightweight design, convenient to carry