The NF-562 is a professional noise tester with portable size and stable function.This device can directly test decibel levels in any environment precisely and quickly. It is mainly used to monitor environmental noise levels in construction sites, entertainment facilities, living communities etc. Features: High Precision: The noise meter has high sensitivity, high precision microphone sensor, measuring 30 to 130 noise levels. Accuracy: 1.5, Resolution: 0.1 A Weighting, Fast/Low Speed Measurement: A weighting simulates the frequency of low-strength human ear noise and is suitable for detection of environmental noise. For general environmental measurements, the fast response speed is 125 milliseconds. If the noise level fluctuations are relatively large, the low response speed is 1 second. Data retention, max/min measurement: The sound pressure level meter has a max/min measurement. highest/lowest peak Data retention function locks the current reading value over sound measurement according to individual needs Digital LCD display: High resolution energy-saving screen backlight button to turn on the backlight for easy viewing in dark places: Mainly used in residential, construction sites, factories, restaurants, entertainment facilities, and other environmental monitoring scenes Specifications: Model: NF-562 Material: ABS Display: FSTN LCD Screen Button: 4 function buttons Sensor: Capacity microphone. Noise testing: testing range : 30~130 Test Accuracy: 1.5 Resolution: 0.1 Test Speed: High Speed: 125ms Slow: 1s Out of Range Alert: Yes MAX/MIN Test: Yes Auto-Off: 5 minutes without operation Data storage/Backlight: Yes LCD Backlight Control: Yes Low Battery Warning: Yes Battery: 3 x 1.5V AAA batteries (not included) Item size: 160 * 50 * 3 0mm / 6.29 * 1.97 * 1.18in Package Weight: 200g / 7.05 Package Size: 21 * 10.6 * 4.5cm / 8.26 * 4.17 * 1.77in Package List: 1 * Sound Level Meter 1 * User Manual (English)