A testing module includes a first input, a second input, an output, a decoder module, an analog to digital converter, and an output generator module. The first lens array is provided with a plurality of first convex lenses and a first transparent holder formed integral with the first lenses. The accessory may be capable of communicating with a power tool and an inventory system via the communication member. A quantity of particles including delayed water-swelling particles formed at least in part from a water-swelling material and, optionally, non-water-swelling particles of the same or different size distributions can be used in treating a formation penetrated by a wellbore. A defect analyzer is operative to receive the inspection output and to provide a defect report. This arrangement prevents activation of only a portion of the load elements where electrical connection between them is not successfully established.