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...Unit errors in measurement structure introduction objectives classification of gross systematic random accuracy and precision calibration the instrument analysis error on common sense basis statistical experimental data summary key words answers to saqs a quantity is based some international fundamental standards these are perfectly accurate while others derived from not spite all precautions general any done by comparing with which themselves so only due methods but also being thus possible method physical its deviation actual value if an experimenter knew he or she would correct it no longer be other real those factors that always vague extent carry amount uncertainty reasonable definition may taken as have vary great deal depending upon circumstances experiment perhaps better speak instead because magnitude uncertain at this point we mention types cause first there can blunders apparatus construction invalidate second certain fixed will repeated readings roughly for unknown reasons ...