Patent ID: 7400991

Claim:
A contact type displacement meter that measures a physical displacement amount of an object, comprising: a contactor that stretches by coming in contact with the object; a conversion section that converts a displacement amount of the contactor into an electric quantity; a setting section that sets the electric quantity obtained by the conversion section as a reference value, when the reference value for judging whether the contactor is good or bad is set and when the reference value for correcting a measurement value of the displacement amount is set; a storage section that stores the reference value set by the setting section, when the reference value for judging whether the contactor is good or bad is set; a first judgment section that judges whether the contactor is good or bad by the difference between the reference value set by the setting section and the reference value stored in the storage section, when the reference value for correcting the measurement of the displacement amount is set; a first output section that outputs the judgment results by the first judgment section; and a correction section that obtains the electric quantity obtained by the conversion section as a measurement value and corrects the measurement value by using the reference value for correcting said measurement value set by the setting section, when the displacement amount of the object is measured.