The Mitutoyo 530 series vernier calliper has two sets of jaws and a depth bar for four-way measurement in inch units of outside dimension (OD), inside dimension (ID), step, and depth, for applications where the highest accuracy is required, especially in scientific research and in industries where parts must fit exactly.
The calliper has a dual vernier scale, with both the upper and lower scales measuring in inch units. A 14-degree vernier face angle improves visibility and helps prevent parallax error in measurement reading. The calliper'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. 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 calliper is made of hardened, corrosion-resistant stainless steel with a satin chrome finish that helps reduce glare. The calliper meets Federal Accuracy Specifications GGG-C-111B.