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The Starrett dial caliper has sharp black graduations every 0.100" on the no-glare, satin-finished stainless steel bar, and graduations on the dial every 0.001". One full revolution of the dial is equivalent to 0.100". These calipers have knife-edge contacts for measuring both inside dimensions (ID) and outside dimensions (OD). The knife-edge contacts can be used to scribe parallel lines on the workpiece. This caliper can be used with one hand through operating the fine adjustment roll with the thumb. The lock screw locks the dial bezel and holds the sliding jaw in position. The depth rod is integrated into the rack of the caliper, unlike many calipers which offer a detachable depth rod, or none at all.
The hardened stainless steel components, including the bar, measuring surfaces, rack, gears, and depth rod, offer corrosion resistance, increased accuracy, and long life. Positive split gear anti-backlash control offers increased accuracy over standard gear configurations. Backlash is the amount of clearance between mated gear teeth in the caliper controls, which prevents the gear teeth from jamming. It is undesirable to have much backlash due to the lack of precision offered by the increased amount of play between gears. Certain gear designs can minimize or eliminate backlash; split gear systems actually split the gear into two gears, each half as thick as the original gear. One of these gears is then fixed to the shaft while the other gear is allowed to turn. The free-turning gear is connected to coil springs that rotate it until all of the backlash in the control system has been eliminated. The rack teeth point down to keep foreign matter from clogging the gear operations. This prevents measurement errors where metal chips could interfere with proper caliper operation.
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.From the Manufacturer
The only American made Dial Caliper. The is one of the handiest measuring tools available, used by meachanics and toolmakers everywhere. It is direct reading, reliable, and accurate
Martins Elleris
Reviewed in the United Kingdom on June 22, 2024
All good Thank You
John
Reviewed in the United States on March 12, 2023
It feels like quality, and it’s as accurate as I could ever care to be
victor
Reviewed in the United States on February 17, 2023
Couldn't even measure bearings shims 4 times without failure feel it sticking and binding when moving jaws garbage product not Starrett of years past mitutoyo from here on out for me
Philip Landreth
Reviewed in the United Kingdom on June 21, 2022
This dial calliper is now my favourite measuring tool. I have digital callipers but in certain applications, I get different readings which is not helpful. The Starrett dial calliper from the USA is a quality tool and repeat measuring delivers the same result which is obviously what you would want. I wish I had bought one of these ages ago - not cheap of course but worth every penny.
Robert D Turtle
Reviewed in the United Kingdom on April 8, 2022
It does what it says. Instead of using a ruler which is +-1mm (usually more if you don't use it really well), or a former which you need to copy +-0.5 using a good wood marker; this will tell you with such precision that the joints will need to be tapped into place. Once in place, they're certainly not going to come apart.Totally recommended for anyone looking to measure pieces of wood, or detailed cuts therein.
unixoideswesen
Reviewed in Germany on September 25, 2021
Auf der roten Skala ist der Zeiger des Starrett R120A-6 Messschiebers in den meisten werkstatttypischen Lichtsituationen gut zu erkennen. Wer mal etwas in Inch messen will, ohne umzurechnen und gerne Uhrenmessschieber mag, findet vermutlich nichts besseres. Eine ähnliche Qualität gibt es noch bei Tesa oder Mitutoyo, aber die Skala bei Starrett gefällt mir besser.
Sabrina .B.
Reviewed in Italy on April 19, 2021
Direi che ho fatto un vero affare.
shane
Reviewed in the United States on August 1, 2020
When comparing these Starrett calipers made in USA to a $30 set of calipers made in China, it's a lot like comparing a Rolex watch to a Timex. Both can be accurate and made of stainless steel, and they look similar in photos, but when you actually hold it, there's an obvious quality difference which you can see, feel, and even hear. Mine came with an inspection certificate with the inspector's name stamped on it. The tool was perfectly zeroed upon arrival. I couldn't be happier with this purchase.
Jordan Armstrong
Reviewed in the United States on March 6, 2020
It took some digging to find an American made verner caliper and this is the only one I found. It Is accurate, well built, easy to read with the red background, and most Importantly made in the USA. I would recommend spending the extra money on this item. Also it comes in a standard starrett red plastic case. And the caliper its self doesn't have plastic on it like the cheaper models.
Phong
Reviewed in the United States on January 29, 2020
😁
99
Reviewed in the United States on January 26, 2020
it seems to be high quality and accurate--but it should be for the price you pay. My only downgrade is that the plastic case it comes in is a bit cheapo and it may not do a good job.
JimSmith4321
Reviewed in the United States on April 30, 2019
I have had numerous calipers, including two others made by Starrett (an electronic display and the imported 3202-6) but the R120A-6 has quickly become my absolute favorite. The red faced dial renders the pointer shadow almost invisible. Accuracy is in precise agreement with feeler gauges and gauge blocks at numerous values between 0.001 and six inches), the sliding action is perfect, and the overall quality is excellent in every respect. If you use calipers on a regular basis I think you'll find like I did that the higher cost is very much worth it.
Samuel Langhorne Clemens
Reviewed in the United States on March 12, 2016
So glad I got this caliper after researching quite a bit. It has worked flawlessly since I got it. This is definitely the type of thing where you get what you pay for. Im never disappointed in my investment on good quality tools!
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