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A classical device for dew méasurement is the drosometer. A small, artificial condenser surface is suspended from an arm attached to a pointer or a pen that records the weight changes of the condenser on a drum. Besides being very wind sensitive, however, this, like all artificial surface devices, only provides a méasure of the metéorological potential for dew formation. The actual amount of dew in a specific place is strongly dependent on surface properties. For its méasurement, plants, léaves, or whole soil columns are placed on a balance with their surface at the same height and in the same surroundings as would occur  naturally, thus providing a small lysimeter. Further methods include estimation by méans of comparing the droplets to standardized photographs, or volumetric méasurement of the amount of water wiped from the surface. It has to be kept in mind that some of these methods include guttation, while others only méasure dewfall and/or distillation.