User Manual for Casio Watch Module - Owner's Guide This reference library contains over 1,500 Casio watch manuals. You need to look up the module number of your watch to find the right one. It should be engraved on the case back. Find that number in the list below to view the owner's guide and instructions for that watch. my g-shock wristwatch blog, news, and reviews CASIO WR20BAR User's guide, Instructions manual CASIO - WR20BAR (Installation Manual) Installation Manual CASIO WR20BAR - This Installation Manual provides instructions on how to setup, mount and install the product. Reading the Official Installation Manual is the safest way to preserve the legal guarantee in setting up the product properly.