• Ability to measure distance between points too far apart to be reached with dividers
• Hardened steel, adjustable divider points for durability and flexibility
• Points screw into heads for flexibility of use, while the pencil socket can be used in place of either point
• Straight legs for marking out work pieces by scribing and marking distances between points
• Heads accommodate a beam up to 3/8" (9.5 mm) thick and 3/4" (19 mm) wide

The Starrett 50A improved trammel heads with adjustable divider points (2-1/2” and 3” size) and pencil socket measure the distance between any two points that are too far apart to be reached with dividers. The heads are die cast with black wrinkle finish and have hardened, forged steel points, for easily reproducible and accurate transfer of measurements, scribing lines, arcs, and circles, and marking distances between two points. The heads accommodate a beam up to 3/8” (9.5 mm) thick and 3/4” (19 mm) wide.

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 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 also for measuring size differential between two objects. 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.

The L. S. Starrett Company was founded in 1880, originally manufacturing bench vises, squares, and other tools. They acquired other companies throughout the years, expanding their services into making precision measurement instruments and tools, such as calipers, micrometers, saw blades, and gauges. Starrett is headquartered in Athol, Massachusetts and has manufacturing facilities in Brazil, the United Kingdom, China, and other locations.

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