Extech 407744 Sound Level Meter, 94dB, 1kHz max

The FLIR Sound Level Calibrator is a professional device designed to calibrate and verify the operation of Sound Level Meters with 0.5 inch or 1.0 inch microphones. It is complete with two 9V batteries, a carrying case, and a screwdriver, meeting the IEC standard 60942 1997-11.

Calibrates and verifies Sound Level Meter operation
1kHz sine wave at 94dB with frequency accuracy of 5%
Total Harmonic Distortion (THD) less than 2% at 94dB
Battery test position with status LED for battery verification
Durable die-cast aluminum housing for long-lasting use