SOUND LEVEL METER This is a professional Sound Level Meter, it can measure the ambient sound level, such as sound level around factories, workshops, schools, residential, offices, road, audio etc. It also can be appropriate for noise engineering, product quality control, health prevention and treatment, etc. Specification: Sound pressure accuracy: ± 1.5 dB ( sound pressure standard, 94 dB @ 1KHz) . Sound pressure accuracy: ± 5 dB ( sound pressure standard, 94 dB @ 8KHz) . 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 intotal. Automatic shifting gear level: microcomputer will automatically select the best gear level in the range from 30to 130 dB. Below or above limit prompt: indicated with “ UNDER” or “ OVER” display. Power supply: 4 x 1.5V Battery Operating temperature: 0 ~ + 40 ° C Operating temperature: 10 ~ 80 RH Storage temperature: - 10 ~ + 60 ° C Storage humidity: 10 ~ 70 RH Outside measurement: 193 ( L) × 60( W) × 29 ( H) mm