ND9B - Digital Sound Level Meter Calibrator Professional Noise Decibel

FEATURES:  ​Simple amp; Easy OperationDigital Display with Backlight, Clearly Shows the Chosen dB LevelLightweight and Small SizeRemovable 1/2 #34; Transducer Cap, Suitable for 1 #34; and 1/2 #34; Microphone SizeConforms to IEC60942 (IEC942) Class 1 Standard.Solid Design Provides Accurate and Reliable PerformanceSuitable for Personal, Field and Laboratory use ​complete Set Includes:  1 x Sound Level Calibrator 1 x English Manual Standard Package SPECIFICATIONS:  Sound Pressure Level: 94dB amp; 114dB Accuracy: ±0.3dB (20°C, 760mm Hg) Frequency: 1000±0.01% Hz allows calibration with A,B,C or D weighting networks or linear Microphone Size: 1 #34; and 1/2 #34; 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: -10~50°C Storage Temperature: -40~65°C(batteries removed) Power Supply: 2 x 1.5V AAA (excluded) Size: 137 x x51 x 51mm