Mini Digital Sound Level Meter Noise Decibel Monitoring Tester Tool Description: This mini sound meter is great for measuring and monitoring noise and sound in any environment. It has more compact design and easier e 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: 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