Westward Outside Spring Caliper 40L720 The Westward 40L720 is a type of outside spring caliper used in a variety of mechanical and industrial applications for accurate exterior measurements. Its sturdy steel construction and spring joint mechanism, which sustains constant tension, guarantee accurate and reproducible measurements. For jobs needing precise dimensional measurements, such as metalworking, machining, and quality control procedures, this caliper is perfect. Range / 0 in to 6 in/0 mm to 150 mm Joint Type / Spring Maximum Measurement / 150 mm, 6 in Maximum Measurement - Inch / 6 in Maximum Measurement - mm / 150 mm Nut Type / Solid Tip Type / Solid Points Caliper Material / Steel Leg Style / Flat