T&D Corporation”s family of wireless data loggers can be used to monitor temperature, humidity, voltage, pulses on/off cycles, etc. The RTR-5 family is portable and waterproof with battery life up to two years. These units are ideal for use in wet, freezing, or high-humidity environments. The handheld portable data xollector features real-time monitoring with audible alarms, the ability to download logged data from the loggers, and view the results with graphical displays. In addition, the data can be downloaded via USB connection to a PC. The network-connected data collector provides a LAN interface using a wireless 802.11b option. The built-in Web server allows viewing through a Web browser. Additional features include real-time monitoring and auto-downloading of logger data. The RTR-5W can also be set to automatically originate e-mail warnings and text messages to cell phones if pre-programmed limits are exceeded.