• Metric measuring dial, for readability
• Outside (OD) measurement capability, for measuring groove thicknesses and hard-to-reach external measurements
• Ball measuring contact points, for consistent readings over entire range
• 0.05-mm dial graduation, for precision measurements
• 0.05-mm accuracy rate, for high accuracy readings

The Mitutoyo 209-602 external dial caliper gage uses a dial to perform outside (OD) measurements between 0 and 50 mm. It measures groove thicknesses and other hard-to-reach outside dimensions. For highest levels of accuracy, this caliper is used with a ring gauge, setting ring, or micrometer.

An external dial caliper gage is one of the simplest forms of calipers. It takes hard-to-reach outside measurements. The gage has two spring-loaded arms that make point contact with constant measuring pressure. It is a simplified version of a dual scale dial caliper. The dial is circular and has a pointer; it is mounted on a toothed gear track which drives the pointer. The minimum measurement of the dial creates the accuracy of that result. The dial is marked in inches or millimeters and can be rotated beneath the pointer to measure size differential between two objects. The dial caliper is easier to read than the vernier caliper, thus safeguarding against reading errors. Its precise measurements complement the use of the vernier caliper; the dial provides readability and interpolating measurements which most vernier calipers, due to their need for direct observation of both scales, may not provide. The dial caliper gage can be used along with a setting ring or micrometer; the moveable bezel is adjusted before use by bringing the zero point to an identified size. This caliper gage utilizes a simple metric measuring dial for readability in OD measurements.

The 209-602 dial caliper gage measures in millimeters, is graduated in 0.05 mm increments, and weighs 290 g. It has ball contact point measuring tips for external (OD) measurements, a maximum probing depth (throat depth) of 170 mm, a maximum groove depth of 20 mm, and a minimum groove width of 7 mm. Range is 0 - 50 mm, resolution is 0.05 mm, measuring force is 1.8 N or less, and accuracy is rated at + or - 0.05 mm, 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. Some digital calipers can hold data readings between measurements and send them to data collection devices.

Founded in Tokyo in 1934, Mitutoyo is a leader in the metrology field, producing high-quality measurement products, including mechanical, dimensional gauging products, focusing on micrometers, calipers, indicators, and other measurement tools, as well as output gauges, interfaces, data collectors, and analysis software. Mitutoyo formed Mitutoyo America Corporation in 1963, which is headquartered in Aurora, Illinois, with additional locations in the U.S. and Canada.

The Mitutoyo 209-602 is supplied with a fitted carrying case.

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