MCP JD-IXFA-7G9V Sound Decibel Meter, Sound Pressure Level Meter 30-130 dBA Non-magnetic Electronic Level  (13 cm)

Sound Decibel Meter, MCP Digital Mini Sound Pressure Level Meter, Audio Noise Measurement 30-130dBA,MAX/MIN Hold,Auto Backlight Display Compact, Lightweight Design, Easy to Use There is a calibration knob. You can make use of the calibration function to ensure the accuracy of measuring noise value, reducing error. With a wind-resistant ball, while reducing the effects of wind noise. It is Designed to fit comfortably in the palm of your hand. Auto power-off or manual shutoff by pressing the power button for two seconds. MAX/MIN Hold Function will hold the highest/lowest reading until a higher/lower reading is picked up. How to calibrate the item Normally you don’t need to calibrate it because it was calibrated before delivery. There is a a calibration knob. You can find some tool fit the knob size to poke into the knob. Like needle, small cross screwdriver, iron nail, toothpick and so on. Widely Applications This sound decibel meter is applicable for the measurement of noise engineering, quality control, health prevention and various environmental noises, including noise measurement in such various places as factories, offices, transporting routes, families, stereo equipment and other places. Warm Prompt 1. Please don’t use the meter under a high temperature and humid environment. 2. Please take out the batteries when not in use for a long time to avoid electrolyte leakage and damaging the meter. 3. When measuring the noise outside, please mount the wind-resistant ball on the head of the microphone from being directly blown by wind and measuring other noise.