A and C weighting network selection .Digital display, good anti-interference performance, power saving .With the backlight feature, it is appropriate for gathering the sound data at night. To save power, backlight auto power off function is provided. Composite material injection molding process is adopted for casing with anti-drop structure design. It is not only extremely wear-resisting, but also elegant. With power saving and high-reliability circuit design, well-designed high-efficiency power supply circuit makes the batteries more durable. Specifications:Sound pressure accuracy: ± 1.5 dB (sound pressure standard, 94 dB @ 1KHz). Sound pressure frequency response: 30Hz - 8KHz. Dynamic range of sound pressure: 50 dB (for each measurement gear level). Sound pressure measurement scope: 30-130 dBA, 35-130 dBC. Sound pressure frequency weighting characteristics: A and C characteristics. Dynamic characteristic of sound pressure: FAST 125ms, SLOW 1sec Microphone: polarized capacitive microphone. Digital display: 4-digit, resolution: 0.1 dB, sampling rate: 2 times/sec. Analog bar display: Each analog bar represents 1 dB, sampling rate is 20 times/sec. Measurement gear level: 30-80 dB, 40-90 dB, 50-100 dB, 60-110 dB, 70-120 dB, 80-130 dB, 6 gear levels in total. Automatic shifting gear level: microcomputer will automatically select the best gear level in the range from 30 to 130 dB. Below or above limit prompt: indicated with “UNDER” or “OVER” display. Power supply: 4×1.5V AAA batteries (not included in package) Operating temperature: 0 ~+ 40 °COperating humidity: 10 ~80%RHStorage temperature: - 10 ~+ 60 °CStorage humidity: 10 ~70% RHOutside measurement: 193 (L) x 60(W) x 29 (H) mmWeight: about 122 gPackage Includes:1 * MS6708 digital sound level meter1 * Operating manual1 * Cotton ballBecause monitors and different ligh