An upright vacuum cleaner includes an upright housing section and a nozzle section. The field instrument includes an enclosure having an opening therein. A plurality of display modules may be provided in a cabinet and adjusted to accommodate varying quantities of boxed footwear for efficient use of retail space. A plurality of text-based range descriptors are defined, such that each text-based range descriptor is associated with a range of field values for one of the range-based data fields.