Based on the context of technical tools and the specific model number, "fd tool 38" almost certainly refers to the (often referred to in industrial supply catalogs simply as a "floor drying tool" or by its SKU variants).
If you are referring to a car scanner (often associated with brands like or Thinkdiag that offer "38 functions"), this is a guide for its operation. fd tool 38
Have you used the FD Tool 38 on a unique project? Share your experience in the comments below. Chicago Tool 38-inch Sweep Floor Squeegee Based on
(I can provide a more specific spec sheet if you clarify the industry). fd tool 38