A cloth presser includes a grip portion, a first press end and a second press end. A strain gauge and an ultra-wide band pulse signal generator are placed on a wrench used to torque the fittings. Then, an opening is etched into the insulating covering, and the lower conductive layer is selectively removed. In at least one embodiment, provision is made of a tap which is located between the rectifier and the first blocking diode and at which the circuit for monitoring the voltage across the charging capacitor is located.