The PCE-HT 71N is a mini data logger designed for prolonged measurements of humidity and temperature. It has a USB port, internal memory for 32,000 readings, software for calculating the dew point, etc. A durable lithium battery powers this device, which stores the humidity and temperature data in the internal memory. The data logger has use in refrigerated transport, supermarket refrigeration units, warehouses, and temperature controlled environments. Since the logger records data chronologically in areas with controlled conditions, the collected data can be transferred to a PC with the USB port. Pre-programming is possible for starting and stopping the measurements at a specific time or date. Intervals can also be set, and are adjustable from 2 seconds up to 24 hours.