Description: This mini sound meter is great for measuring and monitoring noise and sound in any environment. It has more compact design and easier to use compared with traditional meters and so on. It is light weight, compact, ergonomic, and user friendly, making it a great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments. Features: LCD backlight display: provides clear and easy reading even in the darkness. 30~130dB measure range: provides the accurate data of the sound level in your surrounding. Fast/Slow sampling: free response selection, press the button to perform even fast 125ms and slow 1 second response rate for higher accuracy. Min/Max function: allows you to take note of the minimum and maximum sound decibels in your surrounding at any given time frame. Hold function: could freeze the current measurement reading, so you won't have to scramble for a pen to copy those decibels down. 1/2 inch condenser microphone, can withstand one meter landing impact. Automatic power off and low battery indication. Specification: Condition: 100% Brand New Functions Range Resolution Accuracy Noise(A Weighting) 30~130dB 0.1dB 1.5dB Sampling Rate FASH 125ms SLOW 1000ms Overload Indication OL MAX/MIN MAX/MIN Data Hold Hold LCD Backlight Yes Auto Power Off 5min Low Battery Indication 3.0~3.5V Battery 4.5V Current Consumption Working mA 40mA Power off uA 10uA Working Environment Temperature 0~40 Humidity 80%RH Storage Environment Temperature -20~60 Humidity 75%RH Battery: 3 * AAA 1.5V batteries(Not included) Size: Approx. 150 * 50 * 27mm / 5.9 * 2.0 * 1.1 Package Weight: Approx. 132g Packing Included: 1 * Sound Level Meter