Measure the sonic output of just about anything.

The Galaxy Audio CM-140 Check Mate Sound Pressure Level Meter is a small, handheld device that measures the pressure level of sound waves in any acoustic environment. For audio enthusiasts and sound recording engineers, this is a must. The CM-140 meter gives you objective, accurate measurements of SPL, and it's easy to usel. The CM-140 features an electret condenser microphone, MAX/MIN function, level range display, AC signal output, and readings in 0.1dB steps. Frequency range is 31.5Hz to 8KHz. You get up to 70 hours of operation from one 9V battery. Galaxy Audio includes a manual, a 9V battery, and a windscreen with the CM-140 Check Mate SPL Meter.

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Galaxy Audio CM-140 Check Mate SPL Meter Features:

Electret condenser microphone
MAX/MIN function
Level range display
Frequency weighting: A, C
Fast or slow time weighting
AC signal output
Dynamic range: 50dB
Frequency range: 31.5Hz to 8kHz
70 hours battery life
Operation Temp.: 0 degrees C-40 degrees C (<80% R.H.)
Storage Temp.: -10 degrees C-60 degrees C (<70% R.H.)
9V battery
Windscreen