Noise measurement range 35 ~ 135dB (decibel) Noise accuracy 2.0dB (at reference sound pressure level, 94dB @ 1kHz) Frequency response 31.5Hz ~ 8kHz FAST : use a time constant of 125 milliseconds (used by default) Time weighting (F / S switching) SLOW uses a time constant of 1 second (used when the sound value changes considerably) Frequency Weighting Characteristic A (A-weighting) Characteristic Digital Display 4-Digit LCD Display Resolution 0.1dB Measuring Double Gears Lo file is less than 100dB / Hi file is greater than 100dB Data retention: Yes MAXIMUM MINIMUM (Yes (large value and small value measurement) Room temperature measurement 0 ~ 60 C (Celsius) Use 1.5V AAA battery 3 (battery no.7) Operating temperature and humidity 0 ~ 40 / 10% ~ 80% RH Storage temperature and humidity 10 ~ 60 / 10 ~ 7ORH Dimensions 147 59 30 mm quantity: 1 * dB tester