DT‑85A Sound Level Tester 4 Digit LCD Backlight Noise Level Meter for Outdoor 40‑130DB Item Type: Sound Level Meter Material: ABS Model: DT-85A Battery: 9V 1x6F22 (not included) Uses: It can be used as a reference for noise measurement in house purchases, home theater volume settings, household appliances and environmental noise monitoring, etc. Frequency Range: 31.5Hz~4kHz Range: 40~130dB Sound Level Frequency Weighting: A sound level frequency weighting Microphone: 1/2 inch polarized condenser microphone Display: LCD display Display Digits: 3-1/2 digits Resolution: 0.1dB The Highest Number Displayed: 0.5sec Time Weighting: Fastly responding (125ms) Accuracy: ±3.5dB (under 94dB, 1kHz reference conditions) Alarm Function: "OL" will be displayed when the input exceeds the range Automatic Shutdown: Automatically shutdown after 15 minutes without any operation Operating Temperature: 0~40℃ (32~104℉) Operating Humidity: 10~90%RH Storage Temperature: -10~60℃ Storage Humidity: 10~75%