Usage Tips: WIDE APPLICATION: This sound level meter is suitable for monitoring sound quality in factories, offices, homes, schools, theaters, audio systems and construction sites.< 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>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>HIGH PRECISION: This sound level meter is a high sensitivity sensor, which is quick to measure and more accurate.CLEAR READING: The product adopts a 4-digit display, which makes the data of clearer and more convenient reading. Specifications: Brand: SMART SENSOR < p>Model: ST9604 Measurement Range --- --- 30-130dBA Accuracy --- --- 1.5dB from reference SPLpoint to 94dB at 1 KHz Frequency weighting --- --- One weighting Frequency range --- --- 31.5Hz-8.5KHz Frequency rate 39;sampling --- --- 2 times/second Data hold --- --- Maximum and minimum hold Digital display --- --- 4digits< /p> Resolution --- --- 0.1dB Temperature measurement range --- --- -10C~5014F-122F) < p>Precision --- --- 2 Resolution --- --- 0.1 Microphone --- --- 1/2inch Electret Condenser Microphone Power supply --- --- AAA battery X 3 (not included) Package list: < p>1* sound level meter 1* instruction manual Welcome to meet