JD-801 Mini Noise Tester Measuring Instrument High Accuracy 30-130dBdB Meter Digital Sound Level Detector Decibel Meter Monitor with BacklightFeature:1. High Precision & Fast Response: The response time of the noise meter is less than 1s, And the ultra-fast response allows you to easily obtain real-time and accurate sound test values in different environments. The measurement range is 30-130dB, the accuracy is 0.1db, and the resolution is 1db.2. Automatic shutdown and overload alarm: if there is no operation within 10 minutes, the noise meter will automatically shut down to save energy. Overload alarm, when it is less than 30dB, the screen displays "UN"; When it is greater than 130 dB, the screen displays "OL".3. Data hold and lock max/min: short press the "M" key to easily switch between max/min/real-time mode. The "H" (Hold) button can freeze the decibel value currently measured on the screen, which can meet your different measurement needs.4. Easy to Operate: Simple design with 4 function buttons makes the handheld noise meter very easy to use. The ergonomic hand bow and ultra-lightweight design provide a comfortable handheld experience.5. Large LCD Display: A large LCD display with backlight function can provide clear readings, so you can get data under any light.6. Applicable Occasions: Noise meter is an ideal measurement tool for sound testing, which is widely used in factories, workshops, schools and homes. Specification: Product Name: Noise MeterColor: BlackMaterial: ABS Measuring Range: 30dB-130dBDmeasuring Accuracy: 0.1dB Working Temperature: 0-40°c Resolution: 1dB Power Supply: 1X9V Battery (Not Included) Size: About 209*64*40mm/8.23*2.52*1.57 inch (L*W*H) Description: It is a digital mini sound level that can convert the ambient sound into electrical signals, data processing and display the results on the digital display. Performance is a stable, safe and reliable measuring instrument. It is lightweight, compact and portable, with no time or space limit. Ergonomic and user-friendly, which can be widely used in environmental protection, occupational health, industrial enterprises, scientific research and teaching fields, used for ambient noise measurement, machine noise measurement and architectural acoustics measurement. Note:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2cm measurement deviation due to manual measurement.1 X Noise Meter1 X User Manual