Reed Instruments R8090 (SC-05) Sound Level Calibrator for 1/2" Diameter Microphones, +/-0.5dB Accuracy
Brand: REED Instruments
Generates stable acoustic signal at a controlled frequency and amplitude to verify the accuracy of your sound level meter
Simply place calibrator on microphone, turn on and adjust your sound level meter
Output sound pressure levels of 94dB and 114dB
Accuracy of +/-0.5dB
Accomodates 1/2 inch diameter microphones