All SPL meters lose their calibration over time. The CM-200 is an SPL meter calibrator, meeting IEC 60942 2003 Class 2 and ANSI S1.40-1984 standards. The CM-C200 can calibrate 1", 1/2 " and 1/4" microphone capsules at 94dB and 114dB.

Designed to calibrate SPL Meters with a microphone diameter of 1/4", 1/2 ” and 1”, the CM-200 will work with any of the CheckMate SPL Meters and many other brands. The CM-200 has a test tone at 1 kHz at both 94dB, and 114dB. The CM-200 includes a protective carry case, battery, and manual.

-Conforms to IEC 60942 2003 Class 2 and ANSI S1.40-1984
-Calibration levels of 94dB and 114dB at 1kHz
-Fits 1", 1/2" and 1/4" diameter microphones
-Weight: approx .41lbs (186.4g) (including battery)
-Accurate and simple to use

Further details can be found on the Galaxy Audio website.