Spring Calipers

The L.S. Starrett Co. was an American manufacturer founded in Athol, Massachusetts in 1880, renowned for precision measuring instruments and machine tools. The company produced high-precision steel rules, calipers, gauges, and grinding machines that became foundational to industrial manufacturing and engineering practice throughout the twentieth century. Starrett instruments were distinguished by exacting tolerances and durability, making them essential tools across aerospace, automotive, and metalworking sectors. The company's output represents a significant material culture of American industrial standardization and craftsmanship.