Extech 407766 Sound Calibrator for 94 or 114dB

Extech 407766 94 114dB Sound Calibrator features: 1kHz Professional Calibrator for 0.5" or 1.0" Microphones; Calibrates and verifies Sound Level Meter operation; LED indicator lights up when power is on; Level position to select 94dB or 114dB; For use on Sound Level Meters with 0.5" or 1.0" microphones; Durable die-cast, aluminum housing; 1kHz sine wave at 94dB/114dB is generated to an accuracy of 5% (frequency) and +/-0.8dB.