Starrett Stainless Steel Pocket Slide Caliper with Slide Stop and Knurled Clamp Screw - Compact Size, Easy One-Hand Operation, 0 to 3-3/4" Range, 64ths Graduations - 1025ME-130

The Starrett 1025ME-130 stainless steel pocket slide caliper fits easily in a shop coat pocket and is precise to 1/64” inch and 1/2 mm for quick yet precise measurements. Readings are made directly from two lines marked “in” and “out” on one side of the caliper stock. The outside range is 0 to 3-3/4” (0 to 96 mm) while the inside range is 1/4 to 4” (6 to 100 mm).

The back of the caliper stock has a metric scale to allow the caliper to be used as a steel rule as well, for easy and fast estimation of rough measurements. The knurled thumb piece activates the slide, while the slide stop prevents the tool from being disassembled. The clamp screw has a left hand thread for easy one-handed operation. The jaws have a straight measuring surface for outside measurements and rounded nibs for inside and hole measurements. The jaws are 1-3/8” (36 mm) deep, while the closed nibs are 0.236” (6 mm) wide. The graduations on the stock are in 1 mm increments, while the graduations on the slide are in 1/2 mm and 1/64” increments.

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.