Patent ID: 7317311

Claim:
A wafer handling checker comprising: a plurality of training operation wafers each formed of a semiconductor or ceramic material to which a conductive film or a material having conductive properties is applied on a face thereof; a cassette having a plurality of slots for housing the plurality of training operation wafers, and a plurality of electrodes for contacting the plurality of training operation wafers when the plurality of training operation wafers are inserted into the plurality of slots; a vacuum pincette having a conductive suction part for operating on the plurality of training operation wafers; voltage application means for applying a voltage between each electrode of the cassette and the conductive suction part of the vacuum pincette; and state detection means for detecting which of the plurality of training operation wafers housed in the cassette the vacuum pincette is in contact with by detecting a potential of each electrode of the cassette or a current flowing to an electrode of the cassette associated with the contacted training operation wafer.