Extech 407744 1kHz Sound Level Calibrator.
94dB Sound Calibrator
1kHz 94dB professional sound calibrator for 0.5" or 1.0" microphones calibrates and verifies sound level meter operation. Battery test position with battery status LED indicates if battery is good.
Durable die-cast aluminum housing generates a 1kHz sine wave at 94dB to an accuracy of 5% (frequency) and ±0. 5dB (94dB).Meets IEC standard 60942 1997-11.