The MT668 is a small and compact Temperature and Humidity Data Logger. This is the easiest to use and lowest cost electronic data logger available. The MT668 has a selectable measuring time intervals from 2 seconds to 24 hours and can store up to 16,000 readings for both temperature and humidity. The user can define the upper and lower measurement parameters for temperature and humidity, and if these readings go above or below these parameters, the alarm LED will flash. With its precision calibrated internal temperature sensor, all the user has to do is place the logger in the field and leave it. Once you have gathered the desired information, simply plug the logger into a computer using the USB port and download the logged information. Accessories: 3.6V Lithium Battery Instruction Manual Software Features : 16 000 Readings for both temperature and humidity Temperature -40°C to 70°C Humidity range 0% to 100% RH Selectable measuring cycle- 2s, 5s,10s, 30s, 1m, 5m, 10m, 30m, 1hr, 2hr, 3hr, 6hr, 12hr, 24hr Multi-mode to begin logging Analysis software Wall bracket Alarm function activated when set values are exceeded