Galaxy Audio CM140 Check Mate Sound Pressure Level MeterToday, there is a need to know just how loud your surroundings really are. The CHECK MATES decibel meters are inexpensive tools everybody should own. The Galaxy Audio CM 140 and Galaxy Audio CM 170 meet the same IEC 651 Type 2 standards of SPL meters that cost 5 times as much or more. Windscreen and battery are included with the Galaxy Audio CM 140 and all other CHECK MATE models. The CHECK MATE series SPL (Sound Pressure Level) meters, first