The Triplett SLDL20 USB Sound Level Datalogger can be used to test and verify sound levels for worker safety (OSHA), community noise ordinances, night clubs/concerts, airports, mines, athletic events, construction sites, vehicle testing, wind farms, new product noise reduction, and other applications. The Sound Level Meter meets IEC 61672-1 Class 2 with ±1.4dB accuracy. It can datalog up to 129,920 readings with user programmable sampling rate (1 second to 24 hours) and date/time stamp. It features a 30 to 130dB range plus A and C weighting with selectable fast/slow response time. Additional features include: user programmable high/low alarms, 2 LEDs that display operation, alarm, battery, and memory status, Min/Max, and automatic or manual start. Includes wind screen, 1/2 AAA battery (Triplett 37-66), and software. 1 year warranty.