The Starrett 798A-12/300 dial caliper measures 0 to 12 inches and 0 to 300 mm with 0.0005” or 0.01 mm accuracy. This easy-to-use measuring tool allows for reliable and accurate readings with the slim, streamlined design and large LCD. This caliper is IP 67-certified, 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 heavy-duty bar and slide are a sturdy 3.5 mm thick. Single 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 it is simple to zero the caliper at any position with the clearly marked zero button. It is simple to zero the caliper at any position with a push of the zero button. Easy-to-read LCD is large, with 0.310” tall characters. The caliper shuts off automatically after 30 minutes of nonuse. Linear accuracy meets the internationally used Deutsches Institut fur Normung 862: Vernier Calipers Requirements and Testing (DIN 862) standards. 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 outside measuring jaws on this caliper are approximately 2-1/2” (63.5 mm) long, while the inside measuring jaws are approximately 3/4” (19 mm) long.

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.

• CR 2032 3V battery
• Fitted plastic case