Sound Level Meter Mini LCD Digital Display Noise Measurement Environmental Decibel Tester Item Type: Sound Level Meter Material: ABS Model: For DT 73S Battery: AAA 3 x 1.5V (Not Included) Purpose: Sound Level Measurement Adopt Standard: EC61672-1:2013-2 Level Frequency Range: 31.5HZ to 8KHZ Measuring Sound Level Range: 30 to 130dB Frequency Weighting: A Microphone: 1/2 Inch Electret Condenser Microphone Display: LCD Digital Display: 3-1/2 Digits Resolution: 0.1dB Time to Update Data: Every 0.5 Seconds Time Weighting: Fast (125 Milliseconds) Accuracy: ±15db ( at 1khz, Standard Audio Alarm Function: Display "OL" When the Input is out of Range (>130B) Automatic Shutdown: Automatic Shutdown After 15 Minutes Without Any Operation Power Supply: 3x1.5V AAA Batteries (AAA) Working Temperature: 0 to 40℃ (32 to 104℉) Working Humidity: 10 to 90%RH Storage Temperature: 10 to 60℃ (14 to 140℉) Storage Humidity: 10% to 75% Relative Humidity