Special bundle includes MK-III-RTI-LR rooftop sensor unit with rain gauge, plus LR IP100 network interface for display on computer, iPad or iPhone with separate app. The MK-III sensor assembly has been designed to offer improved durability and serviceability. This sleek new design is 33 inches high and weighs just over 7 pounds. It is the most accurate, durable and easiest to install weather station available. The initial sensor calibrations for wind, temperature, relative humidity and barometric pressure are traceable to the National Institute of Standards and Technology. The IP-100 facilitates unprecedented transmission and access to real time weather data through multiple formats. Whether connecting online through your computer to our data hosting portal, RainwiseNet, to the RainWise iPhone & iPad app, or by instantly uploading your data to the Weather Underground network, wunderground.com, the IP-100 makes your weather data available to you any time, anywhere!