˜Large LED Wall Hanging Sound Level Meter Auto Alarm Display For Classroom
Concentration Unit Decibel: dBA. 1 x Hole Sticker. Temperature Range: -10℃ -50℃. Humidity Range: 20%-85%. Frequency Range: 50Hz-8.5kHz. Frequency Response Range: 50Hz-8.5KHz. Temperature Range: -10-50℃.