Professional sensor for excellent sensitivity and accuracy Sound quality can be measured in various environments without contact, and test results can be displayed quickly and accurately. High-intensity backlit screen for easy reading in dark environment. With auto-off function, auto-off after 3 minutes without operation, energy saving and environmental protection Widely used in automotive noise test, industrial equipment noise test, home noise test, etc.: Condition: 100% brand new Accuracy: 1.5 dB Frequency range: 31.5 Hz to 8.5 Hz Measurement level: 30-130dBA Resolution: 0.1 dB Over range: LCD display on Time weighting: fast Max: maximum sustain Min: minimum sustain Power: 3 AAA 1.5V alkaline batteries Microphone: 1/2 inch electret condenser microphone Operating temperature: 0-40 Operating humidity: 10%-80% RH Storage temperature: -10-60 Storage Humidity: 10%-70% RH Size: approx. 155*50*25mm/6.1*2.0*1.0in Product Quantity: 1 piece Product color: white Package list: 1 * digital sound level meter