The 381 Clamp Meter has a separate Part Number available for the remote display module. 

In the bill of materials for the Fluke 381 Remote Display Clamp Meter, the part numbers encompass the entire list of everything that make up the entire product, including individual parts of the remote display.

If the customer needs to order a replacement Remote Display Module, looking into the BOM it is not obvious what part number to provide. The individual parts of the remote display are all listed, but not one for the entirety of the remote display itself as a standalone product they could order.

Instead, this is listed as a separate product, and the correct one depends on the Serial Number of the main unit.

Users with 381 Serial Numbers <66010001MV or <65480162WS would use Part Number 3766445 | FLUKE-381-4202,DISPLAY
Users with 381 Serial Numbers >66010001MV or >65480162WS would use Part Number 6082049 | FLUKE-381-4202,DISPLAY,TTBLE