The Lascar EL-USB-2-LCD Temperature and Humdidity USB Data Logger Measures and Records Temperature and Humidity using an internal sensor and shows current readings on an lcd display. The logger has a measurement range of -35C to 80C (temp) and 0 to 100% RH (Humidity) with a 0.5C (temp) and 3.0% RH (humidity) accuracy. The lascar lcd usb data logger features a 1 year user-replaceable battery, 16,000 sample storage capacity, a user-configurable sampling rate of 10 seconds to 12 hours, alarms and IP67 Rating.Plug the Logger directly into the computer"s USB Port for data logger setup, configuration and download of data for analysis using the included windows software.A 1/2 AA 3.6 Volt Lithium Battery is included with every purchase.