Accessory Thickness

The physical thickness of the accessory housing in centimeters. It's used to position the probe at a consistent height above the device. For disc accessories, this is the depth from the top surface to the bottom. For loop accessories, it's the cross-section diameter of the tubing that encloses the coil. The thickness sets where the measurement surface sits and anchors the height axis of the 3D Field Volume chart and the standoff convention. Disc reports use the full thickness as the probe offset because the probe rests on the disc top. Loop reports use half the thickness because the probe sits at the tube centerline inside the tubing.