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1 gtt Metric = 0.0018 oz wt.
1 oz wt. = 566.99 gtt Metric
Definition of drops 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
Definition of ounce of water provided by TheFreeDictionary
A fluid ounce is a unit of volume (also called capacity) typically used for measuring liquids. Whilst various definitions have been used throughout history, two remain in common use: the imperial and the United States customary fluid ounce. An imperial fluid ounce is 1/20 of an imperial pint, 1/160 of an imperial gallon or approximately 28.4 ml. A US fluid ounce is 1/16 of a US fluid pint, 1/128 of a US liquid gallon or approximately 29.6 ml.