Galaxy Audio CM170 Check Mate Sound Pressure Level MeterToday, there is a need to know just how loud your surroundings really are. The Galaxy Audio CM 170 is an affordable IEC 61672 1 Type II sound pressure level meter that competes with some of the best audio level meters on the market. The CHECK MATES are inexpensive audio level meters that everybody working in loud environments should own. Windscreen and protective case are included with the CHECK MATE models. The CHECK MATE series SPL (Sound Pressure