Geometric Dimensioning and Tolerancing (GD&T) is a system for defining and communicating engineering tolerances. It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models that explicitly describes nominal geometry and its allowable variation.
The broad Starrett product line includes precision measuring tools (micrometers, calipers, rules, etc.), levels, electronic gages, dial indicators, gage blocks and granite surface plates and custom engineered products. The precision group also includes M1 lubricant, and precision ground flat stock. The company also produces metrology equipment, including optical comparators, video measurement and inspection systems and multi-sensor measuring systems, and force measurement and material testing systems. These Starrett products are used by manufacturing companies of many types and sizes to ensure the quality of their products.