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The key metric for high yields in indoor agriculture.

Vapor pressure deficit (VPD) is the difference between the amount of water in the air and the maximum amount of water the air can hold for a given temperature (saturation). It is usually measured in kilopascals (kPa) or bars. A low VPD is indicative of high moisture content in the air and a high VPD is indicative of low moisture content.

The surface of leaves is commonly assumed to be saturated with water. Plant stomatal opening is directly related to VPD. If VPD is too high, stomata will close to conserve water. If it’s too low, stomata may be fully open, but evapotranspiration will be slow and nutrient uptake will be impacted. Both conditions can cause wilting, leaf tip burn and other crop maladies. When VPD is managed correctly, plants will transpire freely, move nutrients readily to cells and maximize CO2 uptake.

Ratings and Reviews

4.2 out of 5
13 Ratings

13 Ratings

JoshGr40 ,

Didn’t work

Didn’t function. Powered down several times and tried to enter data but temp and humidity buttons wouldn’t work. Disappointing.

Mcfreeak ,


Can’t enter info. Buttons don’t work. Shame

App Privacy

The developer, BE Divergent, LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


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