The Mitutoyo 534-118 Long Jaw vernier caliper performs precise inner diameter (ID) measurements to within 0.8", for applications where the highest accuracy is required, especially in scientific research and in industries where parts must fit exactly. This caliper takes inside and outside readings. A thumbwheel permits fast measuring, and a rotating screw controls the caliper’s movement. It has long jaws for hard to reach measurements and a fine adjustment carriage to precisely control upper scale movement.

This caliper has a dual vernier scale, with both the upper and lower scales measuring in inches. The vernier graduation of the upper and lower scales is 0.001". The scales are raised to slide easily and protect the graduation markings. A clamping screw on the upper scale rotates to control scale movement and locks to hold the sliding jaw’s position. A fine adjustment carriage feeds the slider to allow precise movement of the vernier scale. The caliper weighs 1,500g and is made of hardened, corrosion-free steel construction with a satin chrome finish. It has two-way measurement capability: outer diameter (OD) and inner diameter (ID), with long jaws for performing hard to reach measurements. It has a main slide length of 682 mm, a jaw length of 225 mm, a jaw depth of 200 mm, an inside jaw tip length of 18.5 mm, a beam width of 25 mm, and an inside diameter jaw width of 12 mm. Range is 0 (0.8") - 20", resolution is 0.001", and accuracy is rated at + or - 0.003", which meets Federal Accuracy Specifications GGG-C-111B.

Calipers measure the distance between two opposing sides of an object. They make inside, outside, depth, or step measurements, according to their type. Calipers are commonly used in architecture, metalworking, mechanical engineering, machining, manufacturing, carpentry, and medicine. The simplest calipers have two legs to mark the two points and require a ruler to take the measurement. More complex calipers use two sets of jaws instead of legs and have up to two graduated scales. Vernier, dial, and digital calipers all 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 caliper has a scale sliding parallel to the main scale for an additional, fractional reading to improve measurement precision. The dial caliper has a circular dial with a pointer on a toothed gear rack replacing the second vernier scale. As with the vernier, this second measurement is added to the reading from the main scale to obtain the result. The dial caliper is used for measuring size differential between two objects, as well. The digital caliper takes the same sort of differential measurements as the dial caliper by zeroing the display at any point along the slide, with an LCD (replacing the dial) that displays a single, easily read value in both English and metric units.

Mitutoyo manufactures precision measuring tools, metrology equipment, and systems. The company was founded in Tokyo in 1934 and formed Mitutoyo America Corporation in 1963, which is headquartered in Aurora, IL.

What’s in the Box?

• Mitutoyo 534-118 vernier caliper
• Fitted, wooden case