Methods and apparatus for electron beam treatment of a substrate are provided. Each of the pressure-sensitive microcapsules is filled with a dye exhibiting a first single-color, and features a pressuretemperature characteristic to be broken when being subjected to a predetermined pressure within a first temperature range. The intermediate pivot member is pivotally secured to the proximal body portion about a first pivot axis and the tool assembly is pivotally secured to the intermediate pivot member about a second pivot axis which is orthogonal to the first pivot axis.