Thông tin sản phẩm Measuring Range 30¡-30dBA 35-130dBC Accuracy 1.5dB Frequency Range 31.5HZ-8.5KHZ Linearity Range 50dB AC/DC Output yes Auto Power Shut Off yes Low Battery Indication yes Over Range Indication yes Digit & Resolution 5Digits & 0.1dB Time Weighting Selection Fast/Slow Microphone 1/2 Inch Electret Condenser Microphone Frequency Weighting A & C Frequency Weighting yes Max Hold Function yes RS232 PC Interface - Calendar function - Sampling Frequency 2 times/sec