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In the metalworking field, a divider caliper, popularly called a compass, is used in the process of marking out locations. The points are sharpened so that they act as scribers; one leg can then be placed in the dimple created by a center or prick punch and the other leg pivoted so that it scribes a line on the workpiece's surface, thus forming an arc or circle.

A divider caliper is also used to measure a distance between two points on a map. The two caliper's ends are brought to the two points whose distance is being measured. The Starrett Digital Tape Measure 25 Zoom caliper's opening is then either measured on a separate ruler and then converted to the actual distance, or it is measured directly on a scale drawn on the map.

On a nautical chart the distance is often measured on the latitude scale appearing on the sides of the map: one minute of arc of along any great circle , as for example, any longitude meridian, is approximately one nautical mile or meters.

Dividers are also used in the medical profession. An ECG also EKG caliper transfers distance on an electrocardiogram ; in conjunction with the appropriate scale, the heart rate can be determined.

A pocket caliper version was invented by cardiologist Robert A. Oddleg calipers , Hermaphrodite calipers , or Oddleg Jennys , as pictured on the left, are generally used to scribe a line at a set distance from the edge of a workpiece. The bent leg is used to run along the workpiece edge while the scriber makes its mark at a predetermined distance, this ensures a line parallel to the edge.

In the diagram at left, the uppermost caliper has a slight shoulder in the bent leg allowing it to sit on the edge more securely, the lower caliper lacks this feature but has a renewable scriber that can be adjusted for wear, as well as being replaced when excessively worn.

The vernier, dial, and digital calipers give a direct reading of the distance measured with high accuracy and precision. They are functionally identical, with different ways of reading the result.

These calipers comprise a calibrated scale with a fixed jaw, and another jaw, with a pointer, that slides along the scale. The distance between the jaws is then read in different ways for the three types. The simplest method is to read the position of the pointer directly on the scale. When the pointer is between two markings, the user can mentally interpolate to improve the precision of the reading.

This would be a simply calibrated caliper, but the addition of a vernier scale allows more accurate interpolation and is the universal practice; this is the vernier caliper. Vernier, dial, and digital calipers can measure internal dimensions using the uppermost jaws in the picture at right , external dimensions using the pictured lower jaws, and in many cases depth by the use of a probe that is attached to the movable head and slides along the center of the body.

This probe is slender and can get into deep grooves that may prove difficult for other measuring tools. The vernier scales may include metric measurements on the lower part of the scale and inch measurements on the upper, or vice versa, in countries that use inches.

Vernier calipers commonly used in industry provide a precision to 0. They are available in sizes that can measure up to mm 72 in. Instead of using a vernier mechanism, which requires some practice to use, the dial caliper reads the final fraction of a millimeter or inch on a simple dial. In this instrument, a small, precise rack and pinion drives a pointer on a circular dial , allowing direct reading without the need to read a vernier scale.

Typically, the pointer rotates once every inch, tenth of an inch, or 1 millimeter. This measurement must be added to the coarse whole inches or centimeters read from the slide.

The dial is usually arranged to be rotatable beneath the pointer, allowing for "differential" measurements the measuring of the difference in size between two objects, or the setting of the dial using a master object and subsequently being able to read directly the plus-or-minus variance in the size of subsequent objects relative to the master object.

A popular refinement replaces the analog dial with an electronic digital display that displays the reading as a numeric value. Rather than a rack and pinion , these calipers use a linear encoder. Some digital calipers can be switched between centimeters or millimeters, and inches.

All provide for zeroing the display at any point along with the slide, allowing the same sort of differential measurements as with the dial caliper.

Digital calipers may contain a "reading hold" feature, allowing the reading of dimensions after use in awkward locations where the display cannot be seen. Increasingly, digital calipers offer a serial data output to allow them to be interfaced with a dedicated recorder or a personal computer.

The digital interface significantly decreases the time to make and record a series of measurements, and it also improves the reliability of the records. A suitable device to convert the serial data output to common computer interfaces such as RS , Universal Serial Bus , or wireless can be built or purchased. With such a converter, measurements can be directly entered into a spreadsheet , a statistical process control program, or similar software.

Like dial calipers, the slide of a digital caliper can usually be locked using a lever or thumb-screw. Some digital calipers contain a capacitive linear encoder. A pattern of bars is etched directly on the printed circuit board in the slider. Under the scale of the caliper another printed circuit board also contains an etched pattern of lines. The combination of these printed circuit boards forms two variable capacitors.

The two capacitances are out of phase. As the slider moves the capacitance changes in a linear fashion and in a repeating pattern. Lot A. Close details. Please review and confirm your bid. Lot details. Current bid:. Opening bid:. Your current max bid:. Your new max bid:. Total max bid:. Buy it now. Buy it now price:. As your Max bid is at least equal to the Buy it now price, you can immediately purchase the lot.

New bid:. Bidding ends:. Bidding has ended on this item. Since it's been tuned for smaller measurements, it's incredibly reliable when it comes to taking consistent measurements of small objects for DIY or construction work, and the digital display built into the measuring jaws use a simple three-button control system that you can activate with one hand.

However, since it extends out to a total of six inches of measuring space, this caliper can also be useful in larger-scale situations, providing readings on any object that can fit into its jaws while keeping the same level of calibration and accuracy. This, along with its easy-to-use design and straightforward operation, makes it a surprisingly versatile and effective tool. Although it was built for reloading purposes, this caliper can come in handy for a wide range of different jobs and tasks, especially if they involve small objects.

The angular, wrench-like shape of this caliper cuts down on unnecessary weight while still providing a high level of corrosion and rust resistance. Thanks to the smooth components, this digital caliper is surprisingly slick and can take accurate measurements in very little time. The measuring jaws move quickly without being too slippery to use correctly, and they don't 'stick' like with some bulkier designs, making it an excellent choice for people who are trying out battery-powered measuring tools for the first time.

This digital caliper offers the pure basics, making it an excellent tool for quickly taking measurements without needing to work around obstructive features or design choices. Switching between units is as simple as hitting a button, meaning that you can operate almost every feature on the caliper with one hand. Lightweight and easy to use, this caliper manages to be effective without being overly bulky or heavy.

These lightweight digital calipers are designed to be as slim and comfortable as possible while still retaining a familiar design that experienced users will be able to pick up quickly. The easy-to-use settings located on the LCD display screen give you the option of switching between inches and millimeters at the press of a button or setting the current position to zero so that you can compare different measurements much faster.

The thumbwheel at the back of the screen makes it much easier to adjust without needing to use both hands, and you can operate almost everything on the tool one-handed if required, making it much more convenient for measuring objects in hard-to-reach locations or small spaces.

This, combined with its familiar and simple design, means that you'll find it reasonably easy to use regardless of your skill level or past experience. This digital caliper is simple and convenient, providing a lot of different features that can be used one-handed for much faster measurement-taking.

This is especially important for jobs where there are small but vital components involved since you might not be able to judge whether your measurements are correct through sight alone.

Not all calipers will display them to the same decimal point, and there can be a big difference between 0. While this might not be too important for DIY work, it can make a massive difference in industrial work and construction, especially when a situation calls for measurements that are too specific for you to measure properly.

Even if you can convert between unit types yourself, it still wastes time and takes a lot more effort to achieve the same result. Some will also have a step measurement feature, and there are specific designs that use a pull-out depth-measuring stick for judging how deep a hole or dent is in a surface.

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