Usage Tips: <ul><li>WIDE APPLICATION: This sound level meter is suitable for monitoring sound quality in factories, offices, homes, schools, theaters, audio systems and construction sites.</li>< li>30-130DB: The measurement range is 30-130dB, which is very suitable for sound or noise measurement. (Normal conversation sound is 40-60dB).< /li><li>MAIN FUNCTION: With maximum and minimum hold function.Data hold function.Red backlight alarm and sound alarm.Auto or manual power off function.Temperature measurement function.< /li><li>HIGH PRECISION: This sound level meter is a high sensitivity sensor, which is quick to measure and more accurate.</li><li>CLEAR READING: The product adopts a 4-digit display, which makes the data of clearer and more convenient reading.</li></ul> <p></p> <p><b>Specifications:</b></p> <p>Brand: SMART SENSOR</p> < p>Model: ST9604</p> <p>Measurement Range --- --- 30-130dBA</p> <p>Accuracy --- --- ±1.5dB from reference SPLpoint to 94dB at 1 KHz</p> <p>Frequency weighting --- --- One weighting</p> <p>Frequency range --- --- 31.5Hz-8.5KHz</p> <p>Frequency rate 39;sampling --- --- 2 times/second</p> <p>Data hold --- --- Maximum and minimum hold</p> <p>Digital display --- --- 4digits< /p> <p>Resolution --- --- 0.1dB</p> <p>Temperature measurement range --- --- -10°C~50（14F-122F)</p> < p>Precision --- --- ±2</p> <p>Resolution --- --- 0.1℃</p> <p>Microphone --- --- 1/2inch Electret Condenser Microphone</ p> <p>Power supply --- --- AAA battery X 3 (not included)</p> <p></p> <p><b>Package list:</b></p> < p>1* sound level meter</p> <p>1* instruction manual</p><p>Welcome to meet</p>