Hobo ZW Series, a family of wireless data nodes for centralized monitoring of energy use and environmental conditions in buildings, reduces the cost and complexity of data collection by measuring, recording and transmitting real-time energy use and environmental data from dozens of points to a central PC. They form a self-healing, wireless network to transmit logged data and can measure temperature, relatively humidity, kilowatt hours, CO2, AC voltage, amps, gauge pressure and more.