Per Manufacturer's website:
The solar charged battery supply is guaranteed to provide continues operation below 60 degrees latitude. The MK III will operate for at least 60 days without sun.
Since there is no connection between the sensors and the power line, damage from thunderstorms is virtually eliminated and the sensors are immune to power line voltage surges.
The initial sensor calibrations for wind, temperature, relative humidity and barometric pressure are traceable to the National Institute of Standards and Technology.
The passive solar shield for the temperature and humidity sensors are modeled after the ones designed by the National Weather Service. All materials used in the sensor assembly and weather instruments have been chosen for their durability and resistance to weathering and corrosion.
All of our weather station hardware is stainless steel. The station is fabricated from fiberglass and structural PVC and is ultra-violet inhibited.
**there is a small break on rain collector, as pictured.