Calibrator for sound level meters, 1 kHz, levels 94 dB and 114 dB. Can be used for any sound level meter with a 1/2" microphone.
 
PLACID Sound level calibrator is used to calibrate sound level meters and other sound measurement equipment. You can calibrate 1" diameter microphones directly and 1/2" microphones using 1/2" adaptor supplied with the calibrator. With available adaptors, you can calibrate other microphones and instruments.