ND9B Digital Sound Level Meter Calibrator Professional Noise Decibel Tool 94dB & 114dB for 1/2" and 1" inch Microphone

Features ​ SimpleEasy Operation Digital Display with Backlight Clearly Shows the Chosen dB Level Lightweight and Small Size Removable 1 2 Transducer Cap Suitable for 1 and 1 2 Microphone Size Conforms to IEC60942 IEC942 Class 1 Standard Solid Design Provides Accurate and Reliable Performance Suitable for Personal Field and Laboratory use ​Specifications Sound Pressure Level 94dB114dBAccuracy 0 3dB 20C 760mm Hg Frequency 10000 01 Hz allows calibration with A B C or D weighting networks or linearMicrophone Size 1 and 1 2 microphones Temperature Coefficient 0 0 01 dB CStandard IEC60942 IEC942 Class 1Altitude Effects Approximately decrease 0 1dB per 2000 ft increase in altitude from sea level to 12 000 ft elevation or comparable atmospheric pressure change approximately every 50mm of Hg decrease Operating Temperature 10 50CStorage Temperature 40 65C batteries removed Power Supply 2 x 1 5V AAA Not included Size 137 x x51 x 51mmWeight approx 200g Package Includes 1 x Sound Level Calibrator1 x English Manual Details Pictures