Mini digital sound level meter measures from 40 dB to 130 dB and is less than 6" in length! Great for measuring and monitoring noise and sound in any environment, including in the work place, auto sound environments, and home theater rooms. Features MIN/MAX measurement ability with hold and auto power-off function to ensure long battery life. Includes 9V battery and removable wind screen. Frequency range: 31.5 Hz to 8 kHz