Assay balance is a common term in the field of analytical chemistry. It refers to a weighing balance that is used for weighing small amounts of substances to be analyzed. However, there are several synonyms for the term assay balance, including analytical balance, precision balance, and laboratory balance. These terms are all used interchangeably to describe the same type of instrument. The analytical balance is the most commonly used synonym and is often used in reference to high-precision weighing in laboratories. Precision balance is also a widely used synonym and is often used to refer to a balance that is capable of measuring small differences in weight.