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

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 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 %