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The Curvimeter – or opisometer – is a device that measures the length of curved lines and helps to calculate the distance between the points on a map more precisely than a ruler or a compass.
The mechanism has a measuring wheel, a clock face, and a hand. When the wheel moves along the line on a map that you need to measure, the hand moves around the clock face marked with measuring units – centimeters, inches, etc. All you need to do in the end is to check the map scale and to multiply your data by the denominator in the scale. UGears 70138
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2-5/8" plastic Yellow wheel Futaba servo hub
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Hardware extension adds 869.525 MHz radio communication capability to Open4, EvoPrimer and STM32 Primer2 platforms
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