Why is Evapotranspiration (ET) important?

The primary component of hydrologic budgets, evapotranspiration (ET), the sum of evaporation and transpiration from plants, reflects the degree of water loss into the atmosphere, which is critical information when determining irrigation watering needs, groundwater supply levels, drought patterns, and other environmental impacts related to water budgets.

Superior ET Data to Inform Your Decisions

Whether you're focused on environmental research, agricultural research, or crop production, Onset's field-proven HOBO weather stations and sensors provide the accurate and reliable data needed to calculate evapotranspiration to support your water management decisions and understanding, from irrigation to climate impacts on ecosystems.


Remote Monitoring Station Solutions for Evapotranspiration


Data Access Remote access via cellular Remote access via cellular
Memory 32 MB, 2 million measurements, continuous logging 16 MB, 1 million measurements, continuous logging
Internet Connection Cellular Cellular
HOBOnet Wireless Capability Yes Yes (RX2106/05 only)
Inputs 10 (wired) + 50 (wireless) 5 (wired) + 50 (wireless)
Mobile Alerts Yes Yes
Power Options Solar Solar or Battery
Water Level/Flow Yes Yes (RX2104/03 only)


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River running through a marsh with the outlet in the distance

Frequently Asked Questions

HOBOlink provides Reference ET (ETo) for a short canopy, calculated by using the Penman-Monteith equation, which is recommended by the Food and Agriculture Organization (FAO) and the American Society of Civil Engineers (ASCE).

Temperature, Humidity, Wind Speed, and Solar Radiation parameters are all required to calculate Evapotranspiration (ET).

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