Sound Level Meter AR844 GENERAL FEATURES & SPECIFICATIONS   Sound Level Meter / Tester (AR844) Measuring Range 30~130dBA(35~130dBC) Accuracy +/-1.5dB Frequency Range 31.5HZ-8.5KHZ Digits& Resolution 5Digits & 0.1dB Time Weighting Selection Fast/Slow Microphone 1/2 Inch Electret Condense Microphone Frequency Weighting A & C Linearity Range 50dB Sampling Frequency 2 times/sec USB Transmission v Computer Software v AC/DC Output v Auto Power Shut Off v Backlight Display Function v Calendar v Over Range Indication v Sound Measuring Level Selection v Max Hold Function v Low Battery Indication v   PACKING INFORMATION   Power 1.5V AA*4 Alkaline or DC Adapter Product Net Weight 300g / 0.66lb Product Size 265x70x35mm (10.5x2.76x1.38 inch) Packing Gift Box