Ключевые слова: accuracy, accurate, alignment, angle, balance, black, bubble, building, closeup, concept, construction, equipment, exact, fix, flat, green, horizontal, industrial, industry, instrument, isolated, level, leveler, levels, line, liquid, macro, measure, measurement, measuring, object, perfect, precise, precision, ruler, spirit, stability, straight, symmetry, tool, tools, water, work, yellow,