You might see inches on the other side of your metric ruler. The standard metric ruler is 30 cm long. Each centimeter is labeled with a number to show the measurement it's referring to. This is especially important to know if you’re studying science (recall that science generally uses the metric system -not the imperial system). Knowing how to read a ruler in cm is also helpful for people who'd prefer to not work with fractions (which you must do with inches) and who'd like to work with other units instead (in this case, millimeters). A pencil case for school, college or university is not complete without a durable and reliable ruler. The most notable use of a ruler, however, is in office spaces and schools. The printing industry and other industries utilise different types of rulers as well. Different types of rulers can be used in different industries, for example, in tailoring, software, architecture, design and more. Uses of a RulerĪ ruler has had many uses throughout history but has always been a prominent tool in Geometry. Other forms of rulers include a desk ruler, a steel ruler, a carpenter's rule, a seamstress tape and even a tape measure. The first flexible ruler, however, was invented back in 1902 by Frank Hunt. The first folding ruler was created in 1851 by Anton Ullrich. For example, we have metal, wooden, rubber and folding rules to use. The wooden ruler dates back to the 16th Century however, we now have different forms of rulers. The metric system was then introduced into the UK at the start of 1965. The idea was first proposed in 1670 however, it was only standardised in the 1790s, by the French. ![]() In 1799, the metric system was introduced as the existing system was impractical for trade during the French Revolution. The metric system is the decimal measuring system based on the litre, metre and gram as units of capacity, length and weight/mass. ![]() The first ruler was actually a copper alloy rod however, there were rulers made of ivory in 1500 BC. The first ruler did not look like the ones we have in our stockroom. The first noted ruler in history, however, dates back to 2650 BC. In the past, humans have used body parts as ways to measure distances or objects, for example, a hand or foot. Some cool facts about rulers you probably didn't know ! The Invention of the First Ruler Due to the easy fold mechanism on the sides, the paper ruler can be used for measuring and drawing as well. It is stored until you don't delete the browser's cache and cookies.JustFreeTools provides you with an easy to use, free printable online ruler that will save you to ever look for a ruler again! For Letter as well as A4 sized paper, inches as well as centimeters. Therefore, when you come back to the website then you don't need to change it again. Note: PPI numbers will be stored just on your web browser. Lastly, you can use the "Restore PPI" button to refresh all the settings. ![]() Even more, you can change the Pixels per inch(PPI) to make the ruler more accurate and save it for future use.Therefore, using this feature, you can measure the smallest accurate size of the object. When you change it to 1/32 then you can see the very small lines appear in between two inches. There are three graduations that you can choose: 1/8, 1/16, and 1/32. Also, you can change the graduation of an inch. The upper side of the ruler is mm and cm. As mentioned before, the ruler has a mm, cm, and inch scale.So, after removing the object you can see the length clearly. You can click on the ruler to mark a red line. For measuring, firstly, place the object near to the screen.Refer above section if you didn't do that. But we recommend you do the calibration process before using it for very accurate results. It's very simple to use this virtual tool.
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