BTMETER BT-882A Digital Sound Level Meter LCD Noise Measuring Instrument for 30~130 dB

 PRODUCT DESCRIPTION ✅ High-precision sound level meter： Measuring range: 30 ~ 130dBA / 30 ~ 130dBC Accuracy: ±1.5dB Resolution: 0.1dB Frequency range: 31.5HZ-8.5KHZ Sampling frequency: 2 times/sec With LCD backlight, low battery indicator, Overload display, dynamic function adjustment. ✅ A / C switch： Frequency weighting selection switch A / C switch. dBA is the amount of noise that the human ear feels. dBc is suitable for measuring the noise level of machines. If you need to measure human noise, you can convert it to dBA for a more accurate measurement. Select dBc for measurement machine noise. ✅ Level range selection：  Selectable measurement positions：30-80 dB, 50-100 dB, 60-110 dB, 80-130 dB. You can measure more accurately by selecting the level range. If the reading is in the selected level range, it will be displayed "Down" in the upper left corner prompts you to adjust the gear. ✅ AC / DC signal output hole： A wire that can be connected to a frequency analyzer or X-Y axis reco