Product Description Want to test sound levels? Need to understand noise levels? Try our digital sound level meter! It has a wide measurement range (30-130dB). This portable sound level meter is easy to use and is an ideal tool for sound quality control in factories, offices, homes, schools, and construction sites. Product Features: This audio decibel meter conforms to IEC651 Type 2 and ANSI S1.4 Type 2 standards, has a measurement range of 30 to 130dB, and features automatic shifting, A/C frequency weighting mode selection, and fast/slow response speed selection. This mini handheld digital sound level meter is compact, lightweight, and easy to use. It is not only extremely durable but also has a stylish appearance. AC and DC analog signal outputs can be connected to a frequency analyzer or XY-axis recorder for data statistical analysis. Equipped with a backlight function, it is suitable for nighttime sound data acquisition. In addition, it features an automatic power-off function, and its high reliability and carefully designed efficient power circuitry make the battery more durable. Portable and easy to use, suitable for sound level detection, monitoring or control in personal, home, commercial, study, and industrial settings. Specifications: Material: ABS plastic Accuracy: 1.5 dB (based on a standard sound source, 94 dB @ 1 kHz) Frequency Response Range: 31.5 Hz ~ 8 kHz Dynamic Range: 50 dB Measurement Range: 30 ~ 130 dB A, 35 ~ 130 dB C Frequency Weighting Characteristics: A-weighting and C-weighting SPL Dynamics: Fast 125 ms, Slow 1 sec Microphone: 6mm condenser microphone Digital Display: 4-digit, Resolution: 0.1 dB, Sampling Rate: 2 times/second Dynamic Scale Display: 1 scale equals 2 dB or 1 dB, sampling frequency 2 times/second Dynamic Scale Offset: 30 ~ 130 dB, 30 ~ 80 dB, 50 ~ 100 dB, 80 ~ 130 dB Overload Indication: The display shows "UNDER" or "OVER". AC Signal Output: 0.65Vrms per range and full scale, output impedance approximately 600 ohms. DC Signal Output: 10mV/dB, output impedance approximately 100 ohms. Power Supply: 3 x 1.5V AAA batteries (not included). Operating Temperature and Humidity: 0-40℃/32-104℃ (10%-80%RH). Storage Temperature and Humidity: -10-60℃/14-140℃ (10%-70%RH). Product Dimensions: Approx. 215 * 64 * 27 mm / 8.46 * 2.52 * 1.07 in. Product Weight: Approx. 178 g / 6.29 oz. Package Weight: Approx. 336 g / 11.87 oz. Package Dimensions: Approx. 23.3 cm. * 18 * 5.5 cm / 9.18 * 7.09 * 2.17 inches Package List: 1 * Sound Level Meter 1 * User Manual (English)