Professional Audio

CM 150 Checkmate



Galaxy Checkmate header

These days, there is a growing need to know just how loud your audio surroundings really are – and to find out, the Checkmate Sound Pressure Level Meter is a cost-effective and high quality tool every audio professional can own.  The CM-150 meet the same IEC 651 Type 2 standards of SPL meters that cost four or five times as much.   The kit includes the meter, a windscreen, a battery. a 3.5mm jack plug, a calibration screwdriver and a comprehensive user guide.

Galaxy CM150 SPL MeterThe CHECK MATE SPL (Sound Pressure Level) meter, first introduced in early 2003, allows musicians, sound contractors, concert promoters and others to measure SPL in decibels (dB).  A decibel is defined as the unit for measuring relative loudness of a sound.  Many thousands of these units are in use by working musicians,  sound contractors, DJ’s, police departments, racetracks, airports, etc…

Included with each CM-150 is a carrying case,  a calibration screwdriver, operation manual, a 9V battery, and a windscreen.


  • Back light
  • RS-232 interface
  • Graph Indication 
  • MAX/MIN function 
  • Auto ranging (30 ~ 130dB)
  • Level range display 
  • AC/DC signal output 
  • Resolution:  0.1 dB 
  • Auto power off
  • IEC 651 Type II, ANSI S1.4 Type II

    Microphone: ½” Electret condenser microphone 
    Accuracy: ±1.5 dB (ref 94dB @1kHz) 
    Level Range:
    Lo =     30 ~ 80 dB
    Med = 50 ~ 100 dB
    Hi =     80 ~ 130 dB 
    Auto = 30 ~ 130 dB
    Auxiliary Outputs: AC signal output 
    Frequency Weighting:  A and C 
    Time Weighting: fast (125mS) , slow (1 sec.)
    Dynamic Range: 50 dB 
    Frequency Range: 31.5Hz to 8kHz
    Alarm Function: Over, Under 
    Battery: 9V, approx 50 hours life (included)

    Storage Temp.: -10°C~ 60°C (<70% R.H.) 
    Dimensions:  275×64×30mm    (10.8″ ×2.5″ ×1.2″)
    Weight (including battery): approx. 285 grammes (0.764lbs)