1. 3 IN1 DECIBEL METERFDM01 is not only a decibel meter, but also a temeprature meter and humidity meter. 2. ACCURATE MEASUREMENTThe measuring range of the sound level meter is 30dB to 130dB. Highly accurate with ± 1.5 dB. Realtime monitoring gives you accurate data on noise in the area. 3. AUDIBLE AND VISUAL ALARMSSetting high/low alarm values, if the measured value higher than it, Red color alarm back light will light up to alert you it is over the high/low alarm value. 4. BUILT IN RECHARGEABLE BATTERY With 600mAH builtin rechargeable battery. 5. COLOR SCREEN AND BLACKLIGHT Color screen makes data easy to read. With the backlight feature, it is appropriate for gathering the sound data at night. Backlight auto power off function is provided. With power saving and highreliability circuit design, welldesign highefficiency power supply circuit makes the batteries more durable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia