proximity probe 3300 XL 8mm, -13: Unthreaded Length Option. This indicates a length of the unthreaded part of the probe body of 130 mm., -23: Overall Case Length Option. This indicates a total length of the probe body (including threaded and unthreaded parts) of 230 mm., -20: Total Length Option. Refers to the total length of the probe cable (including probe cable and, if used, extension cable). In this case, the total length of the system is 2.0 meters (20 decimeters)., -02: Connector and Cable Type Option. Indicates that the probe is equipped with a miniature coaxial connector ClickLoc™ and a Standard cable (isolated in FEP - fluoroethylene propylene)., -05: Agency Approval Option. Specifies certifications for use in hazardous areas. In this case, the probe is certified CSA, ATEX and IECEx