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. Specifications: Brand Name: SMART SENSOR Color: Black Material: ABS Digital display: 4 digits Measuring Range: 30 xff5e;130dBA 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: 0 xff5e;40 (10% xff5e;80%RH) Storage Temperature: -10 xff5e;60 (10% xff5e;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)