The 300mm Sealey Spring Caliper External is the largest capacity option in the range, specifically designed for measuring bigger components and workpieces where extended reach is essential. This size is particularly valuable in heavy engineering, fabrication workshops, and applications involving larger-diameter cylindrical objects. Perfectly suited for measuring opposite sides of an object for transfer to a rule or micrometer, this caliper features an adjusting washer and nut system that delivers fast, positive adjustment even when working with substantial components. The brushed metal finish provides excellent durability and maintains a professional appearance throughout demanding use. Features and Benefits:300mm capacity for larger components and extended reachSpring-loaded action for smooth, controlled operationAdjusting washer and nut for rapid, positive adjustmentBrushed metal finish ensures long-lasting performanceIdeal for heavy engineering and fabrication work