The SC05 sound meter calibrator generates a stable acoustic signal at a controlled frequency and amplitude to verify the accuracy of your sound level meter.•Complies with IEC 942 Class 2•Output sound pressure levels of 94dB and 114dB•Accuracy of ±0.5dB•Output frequency of 1000Hz ±4%•Accommodates sound meters with 1/2" diameter microphones•Simply place calibrator on microphone, turn on and adjust your sound level meter•Operates on a single 9V battery (included)•Dimensions: 120 x 51 x 43mm•Weight: Approx. 130g