Recording temperature on 2 channels in °C or °F, TR-71wf automatically uploads data over WLAN to Online Cloud Storage service. External sensors allow accurate measurement of temperatures from -40 to +230°F (wider range with optional sensor) inside refrigerator/freezer while logger remains safely outside. Logging capacity is 8,000 data sets, users can view data and receive alarms on mobile device or PC, and USB communication with PC is also supported.