An electronic digital controller, such as a load cell indicator, is disclosed in which a number of components, such as a circuit board, display, and keypad are placed within an enclosure, and the enclosure is bonded closed, such as using an adhesive, to render the enclosure watertight. The brush holder assembly includes a housing having first and second brush chambers, corresponding first and second wire cavities each defining a cavity height, and first and second slots respectively interposed between the corresponding chamber and cavity. The vacuuming system would be powered by either batteries or a cord connection to the cigarette lighter of a vehicle. The apparatus further includes at least two independent caliper assemblies capable of generating data representative of an interior surface of the tubular, wherein each caliper assembly includes an independent force sensor with a sensing member operatively attached thereto.