The Grainger website features precision measuring tools including indicators, indicator holders, and accessories. Indicators measure small distances and are used to check part dimensions and alignment. Common types include dial indicators, digital indicators, test indicators, and lever indicators. Accessories include indicator bases, clamps, stands, extensions, and more. Major brands include Mitutoyo, Starrett, Interapid, Fowler, and more. Overall, this category offers a wide selection of high-quality precision measurement tools for machining and manufacturing applications.