Extech 407766 Sound Level Calibrator, ±1 dB Accuracy, 114dB Output, 0.5 in, 1 in Microphone

The FLIR Sound Calibrator is a professional tool designed for calibrating and verifying sound level meter operation. With a durable die-cast aluminum housing, this calibrator generates a 1kHz sine wave at 94dB/114dB with high accuracy. It meets the IEC standard 60942 1997-11 and comes complete with two batteries, a carrying case and a screwdriver.

It has 1000Hz frequency
It has Total Harmonic Distortion is less than 2 percentage
Its Power is 2 x 9V batteries with 2 years warranty