Feature: 1. The measurement is accurate, and the accuracy of the noise meter can get 土2.0dB, which can be used for noise engineering. 2. It is suitable for noise measurement in various situations such as factories, offices, traffic roads, homes, and audio. 3. The reading is clear, high‑definition large‑screen display, no parallax, convenient for you to read the measurement data, very convenient. 4. Durable, high accuracy condenser microphone sensor, metal shell is safe and anti‑drop. 5. Easy to use, real‑time measurement, fastly respond, A/C weighting, and more professional measurement. Specification: Item Type: Noise Tester Material: ABS Weight: Approx. 218g / 7.7oz Model: SL720 Power Supply: AAA 2x1.5V (not included) Purpose: Noise detection Noise Measurement Range: 30~130dB Noise Accuracy: ±2.0dB (reference sound pressure standard, 94dB01KHz) Frequency Response: 31.5H-8KHz Dynamic Range: 50dB Measuring Range: 30-130dB Digital Display: 4-digit LCD display, resolution 0.1dB Dynamic Characteristics: FAST (fast), SLOW (slow) reacting rate Working Temperature and humidity: 0~40℃, 10-80%RH Storage Temperature and humidity: -10~60℃, 10-70%RH Automatic Shutdown: 10 minutes after no operation. Package List: 1 x Sound Level Meter(Battery Not Included)1 x Tool Bag1 x Manual Note: 1. Do not use it in a place with high temperature and easy humidity.2. Please take out the battery if it is not used for a long time to avoid the leakage of electrolyte and damage the meter.3. Measure the noise outdoors, confirm that there is a sponge ball on the microphone probe to prevent the microphone from being directly blown by the wind, and reduce the interference of wind noise on the tester.