This circumstance is caused by the existing constraint imposed by the specifics of the interaction of modern web browsers (none of which has the functionality of providing web applications with access to information about the display’s physical parameters) with operating systems. In most practical cases, this calculated value does not correspond to the real extent and is instead proposed for consideration as an approximate one for consideration purposes. The diagonal of the current device's display, automatically detected by the browser, is. This presents many of the most common options among users. You can also select the size from the drop-down list (which opens when you click the button ▾, which is adjacent to the numeric input field). Then click the ↹ Calibrate or press the button ↵ Enter on the keyboard. Enter this value in the input field located in the lower left corner of the ruler image. Specify the size of the diagonal of your screen in inches ("). You can calibrate it in one of the following two ways: □ How to use this online rulerįor the ruler to display correctly (i.e., in proportion to the actual physical size), it must be calibrated. The maximum length of the ruler (fully visible when displayed on a sufficient screen) is 20 inches, or 50 centimeters (500 millimeters) for the metric scale option. This online app works on both computers with a large screen (laptops, PCs, monoblocks or smart TVs) and mobile gadgets (phones, phablets, tablets, e-ink readers). You can make the necessary measurements on any device that allows you to browse the web. Red is the default, but you can easily change this if that color conflicts with the color of the screen.If you want to measure the actual size of a small object in inches or centimeters and you don’t have a real ruler at hand, this virtual on-screen online ruler will help you. And the final setting for Line color determines the color of the measurement lines. The setting for Draw feet on cross adds "feet" to the cross lines, so you can better see them. For example, Microsoft recommends increasing this value if you need to measure gradients or shadows. The setting for Pixel tolerance for edge detection can help you more accurately measure certain elements on the screen. The setting for Per color channel edge detection checks if all the color channels are within a tolerance distance from each other. However, if you're trying to measure a moving object, such as an animated GIF, or you need to take a screenshot of the measurement, then turn off this switch. For most results, you'll want to keep this switch turned on. The first setting here for Capture screen continuously during measuring determines whether the tool continuously measures the screen or takes a single snapshot. Next, scroll down to the section for Behavior. If you see inaccuracies in our content, please report the mistake via this form. If we have made an error or published misleading information, we will correct or clarify the article. Our editors thoroughly review and fact-check every article to ensure that our content meets the highest standards. Our goal is to deliver the most accurate information and the most knowledgeable advice possible in order to help you make smarter buying decisions on tech gear and a wide array of products and services. ZDNET's editorial team writes on behalf of you, our reader. Indeed, we follow strict guidelines that ensure our editorial content is never influenced by advertisers. Neither ZDNET nor the author are compensated for these independent reviews. This helps support our work, but does not affect what we cover or how, and it does not affect the price you pay. When you click through from our site to a retailer and buy a product or service, we may earn affiliate commissions. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. ZDNET's recommendations are based on many hours of testing, research, and comparison shopping.
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