Comark, RF311-T, -4deg F - 140deg F Diligence Wi-Fi Temperature Data LoggerFeaturesMeasurement range -20 to +60°C / -4 to +140°FRechargeable internal lithium polymer batteryInitial set-up of the data loggers via the free, easy-to-use PC software applicationBuilt in temperature data logger with integrated displayTemperature selection in °C or °FWireless connectivity to Comark Cloud via your existing WiFi networkLocal Max and Min readings on the LCDCapable of logging greater than 1 million data entriesMemory stores all data even if WiFi is temporarily disconnectedFully featured LCD displaySimple, single button operationLow battery indicatorWiFi connection indicatorUSB port used for recharging (can only be recharged when the unit is between 0 to +40°C / +32 to +104°F)Supplied with Wall Bracket and Micro USB leadThe RF311-T Diligence WiFi Temperature Data Logger measures the temperature of the local environment with its internal temperature sensor. Data is transmitted wirelessly via your WiFi network to the Comark Cloud.The Comark Cloud Dashboard is your new online Home for your Loggers and provides easy access to the critical information regards your system, including; the status of your favourite devices at a glance, review recent device events, view data and clear alerts, quickly navigate to the detail on all your devices.Simply log on to the Comark Cloud Dashboard via your PC, Tablet or Phone.Setup your loggers quickly and easily with the free PC software, after which all configuration is handled from the Cloud.Although the Diligence WiFi data loggers have an impressive range this can be increased by using WiFi extenders.The product will arrive partly charged, but ideally you should charge it for 24 hours before use for optimum performance. The battery can be recharged (unit must be between 0°C to +40°C / +32°F to 104°F) via a PC, a USB +5V wall adapter RF320 (UK/US), or a portable USB battery pack using the USB lead provided. It can also be permanently powered by the RF320 USB wall adapter (not included). Readings may be affected while the internal battery is being charged. However, once charged, continued connection of the charger will have no effect.Battery life is dependent on: transmission period, WiFi encryption method, WiFi encryption key rotation frequency (determined by the router/access point), signal strength between router/access point and WiFi device, presence volume and type of WiFi traffic from other devices, sample rate and operating temperature.From the Comark Cloud Dashboard you can change the data logger's settings to suit your needs, options include;Assigning names to the data logger and each measuring channelSelecting the units of measurementChoosing the sample rate and transmission periodSetting high and low alarm levels for each channelManage Users and LocationsEnjoy an Audit Trail, with detailed reporting, data exporting and notification options, including e-mails and SMS.The RF311-T has a protection rating of IP55. The data logger is IEEE 802.11b/g/n compliant, supports WEP, WPA/WPA2 encryption and enterprise networks. ... Show More Show Less