30-135DB MEASURING RANGE: With a large measuring range of 30-135 dB, the sound level meter can be suitable for many operating conditions.LCD REAR LIGHT DISPLAY: With an LCD backlight display, the measured value of the sound level meter can be displayed quickly and clearly.OTHER FUNCTIONS: The sound level meter has a minimum / maximum / blocked current value, manual / automatic shutdown and could contain the measurement date.SUITABLE FOR: The sound level meter is suitable for checking the sound quality in factories, offices, homes, schools and construction sites.Model: Digital sound level meter SL620Noise measurement range: 35-135dBNoise accuracy: 2.0 dB (reference sound pressure level, 94 dB at 1 kHz)Frequency response: 31.5 Hz to 8 kHzTime weighting: F / S switchingFAST: Use time constant 125ms (default setting)SLOW: Use a time constant of 1 second (used when the tone value changes significantly).Frequency weighting properties: A property (A-weighting)Digital display: 4-digit LCD displayResolution: 0.1 dBMeasuring two gears: low file less than 100 dB / high file greater than 100 dBData retention: YesMAX / MIN: YES (large and small values)Ambient temperature measurement: 0-60 Celsius (degree Celsius)Use battery: 1.5V AAA x 3 (7 battery) (not included)Working temperature and humidity: 0-40 Celsius / 10% -80% RHStorage temperature and humidity: 10 ~ 60C / 10 ~ 70RHWeight: 161 gColour: blackMaterial: ABS+electronic componentsSize: 147x59x30mmPackage Contents:1 * Sound level meter1 * Chinese and English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.