How much is 1 to 2 ml?

The liquid volume 1 to 2 milliliters (about equal to 1 to 2 cubic centimeters, 1 to 2 cc) is about 0.34 to 0.68 fluid ounces, or 0.2 to 0.4 teaspoon.

Fractionally, it is 1/3 to 2/3 of an ounce.