The Fowler 52-008-006-1 Shockproof Stainless Steel Dial Caliper has a covered rack that prevents dirt and debris from clogging the gear and measurement errors. This caliper is used for measuring inside dimensions (ID), outside dimensions (OD), depth, and step. The hardened stainless steel components, including the bar, measuring surfaces, rack, gears, and depth rod, offer improved corrosion resistance, increased accuracy, and increased product life. Self-contained movement eliminates gear misalignment, while the dual pinion drive mechanism reduces wear on the rack and pinion. An adjustable dial enables setting zero. Spring anti-backlash control offers increased accuracy over standard gear configurations. This product has a 1-year warranty offered by Fowler High Precision. Fowler, an American company, manufactures premium inspection and measurement instruments like electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.