The CM150 is a sound pressure level meter with a built-in electret condenser microphone. This new higher-grade CheckMate 150 adds many additional features over the CM140, including an RS-232 interface, graph indicator, auto ranging (30-130 dB), AC/DC signal output and more.

Main Features:
• 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

Specifications:
• Microphone: 1/2" Electret condenser microphone
• Accuracy: ±1.5 dB ( under reference conditions 94dB @1KHz )
• Level Range: Lo = 30 ~ 80 dB Med = 50 ~ 100 dB Hi = 80 ~ 130 dB Auto = 30 ~ 130 dB
• Frequency Weighting: A , C
• Time Weighting: Fast (125mS) , Slow (1 sec.)
• Dynamic Range: 50 dB
• Frequency Range: 31.5 Hz to 8 KHz
• Digital LCD Display: 4 Digits, Resolution: 0.1dB, Display Update: 0.5 sec.
• Analog Display: 50 segment bar graph, Resolution: 1dB, Display update: 50mS
• Alarm Function: Over, Under
• AC Output: 1 Vrms at FS (full scale), Output Impedance: Approx 100W, FS: means the upper limit of each level range
• DC Output: 10mV/dB, Output impedance approx 1KW
• AC Adaptor: Voltage 9 VDC (8-15VDC Max)
• Battery Life: 9V Battery 50 hours (included)
• Operation Temp.: 0°C~ 40°C (32 to 104ºF)
• Dimension: 10.8" x 2.5" x 1.2" ( 275mm?64mm?30mm )
• Weight: Approx. 0.764lbs. (285g)(including battery)