Analytical balance semimicro

Food Chemicals Codex tests and assays are designed for use with three types of analytical balances, known as micro-, semimicro-, and macro-. 

Basically, there is little difference between carrying out experiments on a semimicro (10 to 1,000 mg) scale or on a macro scale. For the smaller quantities, material must be weighed or measured more carefully (using an analytical or semimicro balance and a calibrated pipette), and one uses smaller apparatus. At the lower end of the range, reactions are conveniently carried out in test tubes, which will usually serve as satisfactory aircooled reflux condensers. A simple apparatus which will provide for stirring, the addition of liquid reagents, and drying is shown in Fig. 

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