PROBLEM TO BE SOLVED: To sharply enhance workability by facilitating the carrying-in of respective devices necessary for measuring the state of a coating film, even if the coating film to be diagnosed is located at a narrow place or a high place. SOLUTION: AC voltage is formed by an impedance measuring means (PC card) 5 for detecting a current and the weak current flowing across the electrode 13 of a measuring probe 2 and the ground terminal 4 connected to a substrate metal 21 is measured, while supplying AC voltage to the electrode 13 of the measuring probe 2 to store a measuring result in a portable terminal device 6. The measurement result stored, in the portable terminal device 6, is transmitted to a work station device 7 by a wire system or a wireless system to be analyzed and is diagnosed by a diagnostic server device 9. COPYRIGHT: (C)2006,JPO&NCIPI
