awa class 1 Mulitlevel 104dB 94dB 84dB 74dB

This is a special multi level calibrator. It can be used e.g.  to verify the linarity of a microphone. In addition, for ultra low noise microphones, a typical calibrator with 94dB will overload the microphone    Features Mulitlevel 104dB 94dB 84dB 74dB air pressure humidity temperature Built-in LiPo accumulator can be charged via USB fits 1" and 1/2" optionally 1/4" data output via RS232 TECHNICAL SPECIFICATIONS Sound Level Pressure (SPL)   104dB 94dB 84dB 74dB Accuracy    IEC 60942:2003 standard, Type 1 SPL accuracy     ± 0.3 dB Frequency accuracy   ± 0.2 %