The Ecowitt DS102 data logger helps you record temperature & humidity over a period of time for viewing on a PC at a later date. The USB data logger records up to 20,736 data points and can measure and record data at specified intervals ranging from once every 8 seconds to every 4 hours. Connect to a PC to transfer data, synchronise the logger time and date. Small and compact to fit most peoples needs without be intrusive. Features Measures temperature on C or F Measures humidity Water resistant Upload data to a Windows PC via USB Included DS102 Data Logger USB Cable Instruction manual 1 x CR2032 lithium battery Software CD (electronic download also available) Technical & Manual Measuring range: Outdoor -40°C to 60°C / Indoor -9.9°C to 60°C Datapoints 20,736 Logging interval: 8 seconds to 4 hours Supports up to 3 sensors, 1 WH53 sensor supplied A copy of the DS102 manual can be obtained by clicking here. For those without a CD drive the DS102 software for Windows can be found here.