A must for the serious audio installer or enthusiast. This quality sound pressure level meter gives a digital readout of the ambient noise level at its microphone. Features two ranges: Low (30 to 80dB) and High (80 to 130dB), with two built-in weighting curves. A and C weighting. Response can be switched between slow (1s) or fast (125ms). Features a max hold switch, which displays the highest reading attained. Supplied with protective carry case, tripod mounting adaptor and mic wind screen. Requires 1 x 9V long life battery (included).