Extech 42270 Compact Datalogger for Temperature and Humidity is compact, powerful and easy to use. It records up to 16,000 readings and will record relative humidity and temperature in storage containers, shipping vans, freezers and more. With up to one year of battery life, the Extech 42270 Compact Datalogger for Temperature and humidity logs data for days, weeks or months. Multiple dataloggers can be programmed and data downloaded from one single docking station. Sampling rate from 1 second to 2 hours is user programmable. Windows 95/98/2000/NT/ME/XP compatible software will analyze and store data. Convenient LCD display shows both humidity and temperature. This is a data logger for kits 42275 and 42276.