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圆度误差常用两点法（直径差法）、三点法（V形测量法）测量,即测量被测实际圆上具有代表性的参数（特征参数）来表示误差值。显然,这样的误差值一般不符合GB1958-80《形状和位置公差检测规定》规定的圆度误差定义。用圆度仪测量圆度误差符合圆度定义,精度很高,但圆度仪的使用条件要求高,生产厂家少,价格昂贵,使用不普遍。
Roundness error commonly used two-point method (diameter difference method), three-point method (V-shaped measurement method) measurement, that measured the actual circle measured representative of the parameters (characteristic parameters) to represent the error value. Obviously, such errors generally do not meet the GB1958-80 “shape and position tolerance test requirements” provisions of the circularity error definition. Roundness measurement with a roundness error in line with the definition of roundness, high precision, but the requirements of the use of roundness instrument high, less manufacturers, expensive, not universal.