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The Mitutoyo 530 series vernier caliper has two sets of jaws for measurement in metric units of outside dimension (OD), inside 

dimension (ID), step, and depth (when depth bar is included), for applications where the highest accuracy is required, especially 

in scientific research and in industries where parts must fit exactly. 

The caliper has a dual vernier scale, with both the upper and lower scales measuring in metric units. A 14-degree vernier face 

angle improves visibility and helps prevent parallax error in measurement reading. The caliper’s two sets of jaws provide the 

capability to make OD and ID measurements, as well as step measurements, where the butt end of the fixed jaw measures 

one end of a work piece before its upper/lower or inner/outer steps are measured. When included, a depth measuring blade 

with rounded edges provides the ability to make depth measurements. The scales are raised to slide easily and protect the 

graduation markings. A thumbwheel permits fast and easy measuring. A clamping screw on the upper scale rotates to control 

scale movement and locks to hold the sliding jaw’s position. The caliper is made of hardened, corrosion-resistant stainless steel 

with a satin chrome finish that helps reduce glare. The caliper 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 measureme

nts, according to their type. Calipers are commonly used in architecture, metalworking, mechanical engineering, and machining. 

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 give direct and accur

ate readings and are functionally identical, having a calibrated scale with a fixed jaw, and another jaw with a movable pointer th

at 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 digital caliper takes a differential by zeroing the display at any point along the slide, with an LCD that displays a single 

value in English and/or metric units.