A plug gauge includes a support and protection system that defines a longitudinal axis with a handle closed by a cap that includes electronic devices for the wireless transmission of electrical signals representative of a dimension to be checked, and a probe including a measuring armset coupled with a transducer for generating electrical signals. The drive outputs correspond to the fasteners, are located on a circular path and include a screwdriving tool bit. Successive samples are compared and used to increase or decrease the estimates.