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1 gtt = 1.01 gtt
1 gtt = 0.99 gtt
Definition of medical drops of water provided by Merriam-Webster
the smallest practical unit of liquid measure that varies in size according to the specific gravity and viscosity of the liquid and to the conditions under which it is formed.
Definition of US water drop of water provided by WikiPedia
The drop is a unit of measure of volume, the amount dispensed as one drop from a dropper or drip chamber. It is often used in giving quantities of liquid drugs to patients, and occasionally in cooking. The volume of a drop is not well-defined: it depends on the device and technique used to produce the drop, on the strength of the gravitational field, and on the density and the surface tension of the liquid