Sound Level Meter Calibrator Frequency Source Range 1000 Hz +/-5 Percent Output Sound Pressure 94dB or 114dB Distortion Less than 2 Percent @ 94 dB Operating Temp Range 0 Degrees to 50 Degrees C For Use With Mfr No 407736 407736-NIST 407768 407738 407738-NIST 407790 and 407790-NIST Includes Two Adapters For Use with 1/2 in and 1 in Sound Level Meter Microphones Screwdriver (2) 9 V Batteries and Instructions