EP EP4796916A1
An offset correction method for a potential difference measuring apparatus (100) includes placing a pair of electrode portions (10) including a first electrode (11a) and a second electrode (12a) at a predetermined first position and measuring a first potential difference (V1), placing the pair of electrode portions (10) at a second position at which positions of the first electrode (11a) and the second electrode (12a) at the first position are reversed, and measuring a second potential difference (V2), and calculating an underwater electric potential (Vs1) in which at least an offset of a potential difference caused by a factor other than a test object (80) has been corrected, based on the first potential difference (V1) and the second potential difference (V2).
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