407760-NISTL Sound Level Datalogger can record up to 129,920 records and uses a USB interface for easy setup and data download. The datalogger meets ANSI and IEC 61672 Class 2 standards with a 1.4dB accuracy. Additional features include A and C weighting, Fast/Slow response time, and 2 start methods: programmed (from PC) or manual. Comes complete with software, tripod, USB extension cable, windscreen, and 3.6-Volt Lithium battery. Includes a limited NIST traceable certificate.