Starrett 36-12 Lock-Joint Transfer Type Outside Calliper, With Fine Adjustment, 12″/300 mm Leg Length

The Starrett 36-12 lock joint transfer-type outside calliper with fine adjustment has a leg length of 12” (300 mm) but opens to approximately one-third larger than the leg length. Inwardly curving leg tips measure the external size of an object. Legs are made from high-grade steel and are ruggedly constructed and well-finished. The locking joint can be quickly and firmly locked by a partial turn of the large knurled disc. Transfer arm allows the user to transfer measurements from awkward places where it is necessary to move the legs after they have been set to size. The adjusting screw permits fine adjustment for very accurate measurements. Knurled adjusting nut makes the final adjustment after the legs have been set to approximate size and the joint has been locked. The spring washer under the disc maintains proper leg tension when the joint is loosened. Curved tips transfer the measurement of the external size of an object. Callipers measure the distance between two opposing sides of an object. They make inside, outside, depth or step measurements, according to their type. Callipers are commonly used in architecture, metalworking, mechanical engineering, machining, manufacturing, carpentry and medicine. The simplest callipers have two legs to mark the two points and require a ruler to take the measurement. More complex callipers use two sets of jaws instead of legs and have up to two graduated scales. Vernier, dial and digital callipers give direct and accurate readings and are functionally identical, having a calibrated scale with a fixed jaw and another jaw with a movable pointer that slides along the scale. The Vernier calliper has a scale sliding parallel to the main scale for an additional, fractional reading to improve measurement precision.