Another way to accurately deliver a desired volume is to pour excess liquid in the graduate, then pour out the required volume. For example, if 2 ml of glycerin are needed, one might pour into a 10 ml graduated cylinder 6 ml of glycerin, then pour out the glycerin until 4 ml are remaining. Other hints for measuring liquids are -be sure your glassware is clean and dry. It is important to point out that the Georgia State Board of Pharmacy, on the compounding section of the board exam, will accept 30 ml to be equivalent to one fluidounce. There has been much discussion recently concerning balances in the contemporary practice of pharmacy.
Electronic balances are widely available and are used in many situations in pharmacy.
Electronic balances can be obtained which weigh in every system imaginable. These highly accurate balances competitively priced. However, at the time of this writing, they are not acknowledged by many Boards of Pharmacy. The torsion balance is a sensitive and expensive instrument and it is extremely important to maintain it at all times. Because of this, it is essential that the student learn to manipulate the balance.