Model Number : Sound Level MeterBrand Name : MastfuyiOrigin : Mainland ChinaCertification : NONEPlease be kindly notedthe listed product is produced and distributed abroad and subject to the laws of its country of originFeatures:Professional Sound Level: it is used to measure the sound level of the environment, with fast/slow time weighted switchable for various sound measurement requirement.2.2-inch LCD Display with White Backlit: large screen to display the sound level, temperature(/) and humidity, with manual backlight on/off function.Electret Condenser Microphone: built-in high performance sensor, designed with a windproof sponge to reduce the interference of wind to ensure the measurement accuracy.More Features: MAX/MIN function to display the maximum and minium values, data hold function, and automatic power off function.Compact & Lightweight: easy to operate with single, portable to carry around.Wide Applications: it can be used in factory, workshop, school, office, traffic road, and other places that required sound level test.Specifications:Sound Level Measurement Range: 30~130dBASound Level Measurement Frequency: 30Hz~8kHzDynamic Range: 50dBAccuracy: 1.5dB(94dB@1kHz), 5dB(94dB@8kHz)Frequency Weighting: A weightingTime Weighting: Fast: 125ms; Slow: 1secMicrophone: Electret condenserTemperature Range: -20~60(-4~140)Temperature Accuracy: 0~45(32~113): 1/2; Others: 1.5/3Humidity Range: 0~99%RHHumidity Accuracy: 20~80%: 5RH; others: 6RHOperating Environment: 0~50,