High accuracy datalogging of up to 129,920 records (with real time clock stamp) using a USB interface for easy setup and download. Designed to meet ANSI and IEC 61672 Class 2 standards with ±1.4 dB accuracy. 30 to 130 dB measurement range. It features A/C weighting, fast/slow response time, user-selectable data sampling rate (50 millisecond, 500 millisecond, 1 second, 2 seconds, 5 seconds, 10 seconds, 60 seconds) and two start methods: programmed (from PC) or manual. Complete with 3.6-volt lithium battery, Windows compatible software, USB cover, tripod, and windscreen. Model 407760-NIST is also available with a Certificate of Calibration Traceable to NIST.