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The Starrett 798B series of digital caliper has two sets of jaws for measuring inside dimension (ID) and outside dimension (OD) with resolution to 0.0005” (0.01 mm), an LCD that displays in inches or metric with 0.310" high characters for readability, and an induction-type linear encoding system to help promote high precision measurement. This caliper is IP67-rated, which means that the electronic components are resistant to debris, and are resistant to submersion under standard conditions for up to 30 minutes.
The caliper can be used with one hand through operating the fine adjustment roll with the thumb. A lock screw can hold the slide in position. The hardened stainless steel measuring surfaces offer corrosion resistance and long life, while the bar and slide are a 3.5-mm thick. An induction-type linear encoder system offers high precision in measurements by tracking small movements in position by using a conductor moving through a magnetic field. The caliper supports data output to a computer for statistical process control (SPC) through a non-contact interface cable (sold separately). The CR2032 battery is easy to access, on the front of the plastic casing, next to the LCD. The last measurement position is retained when the caliper is shut off, and the caliper may be zero-set at any position with the clearly marked zero button. The caliper shuts off automatically after 30 minutes of inactivity. Linear accuracy meets the internationally used Deutsches Institut fur Normung 862 (DIN 862): Vernier Calipers Requirements and Testing standards.
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, 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 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 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.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.
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