Features: _x000D_ 1. Professional sensor for excellent sensitivity and precision _x000D_ 2. The quality of the sound can be measured in various environments without contact, and the test results can be displayed quickly and accurately. _x000D_ 3. High-intensity backlight screen display for easy reading at dim environment. _x000D_ 4. With automatic shutdown function, automatic shutdown after 3 minutes without operation, energy saving and environmental protection _x000D_ 5. Widely used in automotive noise testing, industrial equipment noise testing, home noise testing, etc. _x000D_ _x000D_ Specification: _x000D_ Condition: 100% New _x000D_ : SMART SENSOR _x000D_ Model: AS804 _x000D_ Accuracy: 1.5dB _x000D_ Frequency Range: 31.5Hz to 8.5Hz _x000D_ Measuring Level: 30-130dBA _x000D_ Resolution: 0.1dB _x000D_ Over Range: LCD show Over _x000D_ Time weighting: Fast _x000D_ Max: Maximum hold _x000D_ Min: Minimum hold _x000D_ Power Supply: 3 * AAA 1.5V alkaline cells(not included) _x000D_ Microphone: 1/2 inch Electret Condenser microphone _x000D_ Operating Temperature: 0-40 _x000D_ Operating Humidity: 10%-80%RH _x000D_ Storage Temperature: -10-60 _x000D_ Storage Humidity: 10%-70%RH _x000D_ Weight: Approx. 111g / 3.9oz _x000D_ Size: Approx. 155 * 50 * 25mm / 6.1 * 2.0 * 1.0in _x000D_ _x000D_ Package List: _x000D_ 1 * Digital Sound Level Meter