Abstract: A hand-held instrument for reading a bar code symbol obtains print quality parameters by analyzing a signal resulting from code reading, using an internal computer having memory contained in the instrument. The instrument includes a graphic display comprising a display device such as a liquid crystal having a matrix of elements arranged in areas which provide a message containing a plurality of dot matrix characters, other areas where the elements are formed into segments for display of alphanumeric characters and still other areas where the elements are formed into legends. The computer has memory for storing fixed or variable text messages which are selectively displayed depending upon the results of the print quality analysis.

Abstract: A hand-held bar code scanner has a removable boot to hold a field-replaceable optical element, which is sandwiched between an opening formed at the nose section of the scanner housing and the face section of the boot. The replaceable optical element can be, for example, a transparent element, filter, lens, or Brewster Window.

Abstract: A hand-held bar code scanner has a field-replaceable optical element (250) such as a window using a rubber boot (110) to hold the window (250) proximate to the scanner housing (101) in front of the housing. The optical element is most typically a window but may also be a filter or lens.

Abstract: A scanning system utilizing a scanner which is located in a case of size adapted to fit in the palm of the hand or to be attached to the hand along the top outside surface of the hand between the fingers and the wrist. The scanner includes a scan engine within the case mounted on a printed circuit board which scans symbols having data identifying characteristics, which are visible through a window in a side wall of the case. A switch for enabling scanning operations may be provided by a manually actuated trigger on the printed circuit board and an arm which is pivotally mounted on a post which aligns the scan engine in the case and is captured in an opening along a wall of the case. The scanner may be connected by a retractable cable to a retraction unit which can be carried by the operator. The system may be configured with the scanner on the outer side of the hand and held on the hand as by a strap or glove. A light weight arm unit is carried on the forearm.