Ключевые слова: accuracy, background, black, calibration, centimeter, closeup, cm, construction, design, distance, education, element, equipment, graph, graphic, horizontal, icon, illustration, inch, industry, instrument, isolated, length, line, long, measure, measurement, metal, meter, metric, millimeter, number, object, precision, roulette, rule, ruler, school, set, size, stairs, straight, symbol, tape, tool, unit, white, work, yellow,