This noise meter is designed to test sound level in various environment. It is widely used in noise control engineering, quality control, health and treatment, home environment monitoring, etc. Features: This instrument is high precision sound level meter, accuracy up to 1.5dB. Temperature measurement function and Temperature unit selection(/) Red back light alarm and sound alarm function. This digital sound level meter with stable and reliable performance. Wide measurement range from 30dB to 130dBA. Data hold function, maximum and minimum value measurement. LCD display with backlight, convenient to use at night. Low battery indication, automatic & manual power off function. Compact and light, convenient to hold and carry. Equipped with sponge ball for sensor conservation. Applications includes: Environmental measurement, law enforcement, work place design, sound level analysis of machinery and engines. Specifications: Brand Name: SMART SENSOR Color: Black Material: ABS Digital display: 4 digits Measuring Range: 30130dBA Resolution: 0.1dB Accuracy: 1.5dB (under reference conditions) Frequency Range: 31.5Hz to 8.5Hz Frequency Weighting: A Weighting Data hold: Maximum and Minimum hold Sampling Rate: 2times/s Temperature Measuring Range:-10C-50C/14F-122F Accuracy: 2C Resolution: 0.1C Power Supply: 3 * AAA Batteries (Not Included) Operating Temperature: 040 (10%80%RH) Storage Temperature: -1060 (10%70%RH) Item weight: 84g/0.19lb Item size: 15*5*2.8cm/5.91*1.97*1.1in Package weight: 157g/0.35lb Package size: 19.5 * 7.5 * 3.5/7.68*2.95*1.38in NOTE: Please don't store it at high temperature or humidity, high concentration salt or sulfur environment. If don't use it for a long time, please take off the battery to prevent leakage of battery. Please allow 1-3cm differences due to manual measurement. Package list: 1 * Digital Sound Level Meter 1 * User Manual(English)