Want to test the sound level? Need to know the noise level? Try our digital sound level meter. It features a wide measuring range (30130dB) and is portable and easy to use as a handy instrument for sound quality control in factories, offices, homes, schools, and construction sites.Features: This audio dB meter complies with IEC651 Type 2 and ANSI S1.4 Type 2 standards, with a measuring range from 30 to 130 dB. It includes automatic range shifting, A and C frequency weighting mode selection, and high-speed (FAST) or low-speed (SLOW) response rate selection. The mini handheld digital sound level reader is compact, lightweight, and easy to use. It is durable and designed for reliable performance. The AC and DC analog signal output can be connected to a frequency analyzer or X-Y recorder for data analysis. Backlight function allows for easy sound data collection in low-light conditions. Auto power-off function and an efficient power supply circuit help extend battery life. Portable and user-friendly, suitable for checking, monitoring, or controlling sound levels for personal, household, business, educational, and industrial applications.Specifications: Material: ABS plastic Accuracy: 1.5 dB (based on standard sound source, 94 dB @ 1 kHz) Frequency Response Range: 31.5 Hz ~ 8 kHz Dynamic State Range: 50 dB Measurement Range: 30130 dBA, 35130 dBC Frequency Weighting: A and C weighting Dynamic Characteristic of Sound Pressure: FAST 125 ms, SLOW 1 sec Microphone: 6 mm capacitor microphone Digital Display: 4-digit, resolution: 0.1 dB, sampling rate: 2 times/sec Dynamic Scale Display: 1 scale equals 2 dB or 1 dB, sampling frequency 2 times/sec Dynamic Scale Shift: 30130 dB, 3080 dB, 50100 dB, 80130 dB Overload Display: "UNDER" or "OVER" on screen AC Signal Output: 0.65 Vrms per range, output impedance approximately 600 ohms DC Signal Output: 10 mV/dB, output impedance approximately 100 ohms Power Supply: 3 1.5V AAA batteries (not included) Operating Temperature & Humidity: 0C40C / 32F104F (10%80% RH) Storage Temperature & Humidity: -10C60C / 14F140F (10%70% RH) Item Size: Approx. 215 64 27 mm / 8.46 2.52 1.07 in Item Weight: Approx. 178 g / 6.29 oz Package Weight: Approx. 336 g / 11.87 oz Package Size: Approx. 23.3 18 5.5 cm / 9.18 7.09 2.17 in Package List: 1 Sound Level Meter 1 User Manual (English)