In broad terms, a testing machine verifies whether a product or material meets its specified quality or performance requirements before use. Instruments that perform such verification fall within this category.
Testing machines continue to develop to measure different material properties, including yield strength, tensile strength and impact toughness. Instruments used to determine chemical composition are generally described as analyzers rather than testing machines.
Testing machines measure mechanical and processing properties under different conditions, detect internal defects in materials, components or structures, and determine dynamic imbalance in rotating parts.