Want to test the sound level Need to know the noise level Try our digital sound level meter. It's featured with wide measuring range (30-130dB). It's portable and easy to use as a handy instrument for sound quality control in factory, office, home, school and construction site. Features: This Audio DB Meter complies with IEC651 Type 2 and ANSI S1.4 Type 2, with the measuring scope from 30 to 130 dB and automatic shifting function, A and C Frequency Weighting mode selection and High speed(FAST)/Low speed(SLOW) response rate selection. The mini handheld digital sound level reader is compact, lightweight, and easy to use, it is not only extremely wear-resisting, but also elegant. The output of AC and DC analog signal can be connected to frequency analyzer or X-Y axles recorder for statistic analysis of data. Features with backlight feature, it is appropriate for gathering the sound data at night. And auto power off function is provided, high-reliability and well-designed high-efficiency power supply circuit make the battery more durable. Portable and easy to use, suitable for checking, monitoring or controlling the sound level for personal, families, business, studies, industrial, etc. Specifications: Material: ABS plastic Accuracy: 1.5 dB (based on the standard sound source, 94dB 1KHz) Frequency Response Range: 31.5Hz-8KHz Dynamic State Range: 50dB Measurement Range: 30-130dBA, 35-130dBC Frequency Weighting Character: A weight and C weight Dynamic Characteristic of Sound Pressure: FAST 125ms, SLOW 1sec Microphone: 6mm capacitor microphone Digital Display: 4-digit, resolution: 0.1 dB, sampling rate: 2 times/sec Dynamic Scale Display: 1 scale equals 2dB or 1dB, sampling frequency 2 times/sec Dynamic Scale Shift: 30-130dB, 30-80dB, 50-100dB, 80-130dB Overload Display: "UNDER" or "OVER" in display screen AC Signal Output: 0.65Vrms for each shift and full scale, the output of impedance around 600ohm DC Signal Output: 10mV/dB, the output of impedance around 100ohm Power Supply: 3 x 1.5V AAA battery (NOT included) Operating Temperature and Humidity: 040 / 32104 (10 percent 80 percent RH) Storage Temperature and Humidity: -1060 / 14140 (10 percent 70 percent RH) Item Size: Approx. 215 x 64 x 27mm / 8.46 x 2.52 x 1.07in Item Weight: Approx. 178g / 6.29oz Package Weight: Approx. 336g / 11.87oz Package Size: Approx. 23.3 x 18 x 5.5cm / 9.18 x 7.09 x 2.17in Package List: 1 x Sound Level Meter 1 x User Manual (English)