IEC 60942:2003 Class1/ANSI S1.40-1984.
Output sound level : at 94dB and 114dB.
Frequency : 1KHZ ±1%, Class1, A
Accuracy : 94±0.3dB 114±0.5dB Specifications
Sound pressure levels : at 94dB and 114dB.
For 1/2″ condenser microphone calibration.
Low battery indication.
Harmonic waves distortion ±3%.
Output feedback detection.
Power: 9V battery 006P or IEC6F22 or NEDA 1604
Operation environments : 23.0oC ±3oC <85%RH ,850mbar~1050mbar, ≦2000M