Drosometer

[Sarah]

An instrument for measuring the quantity of dew on the surfaceof a body in the open air. It consists of a balance, having a plateat one end to receive the dew, and at the other a weight protectedfrom the deposit of dew.

[Mary Mallozziberg]

A drosometer is an apparatus for measuring the quantity of dew formed in a unit of time per unit area of surface.