Lascar EL-USB-2-LCD 5 Pack USB Temp/Humidity Data Logger w/ LCD Display LCD Display Shows Current Ambient Temperature and Humidity Readings Measurement Range of -35C to 80C and 0 to 100% RH with 0.5C (temp) and 3.0% RH (Humidity) Accuracy 10 Second to 12 Hour Sampling Rate 1 Year Battery Life and LED Operational and Alarm Indicators Includes (5) EL-USB-5-LCD Loggers w/ Batteries. PC Software is Available As A Free Download