Can't you just get a white ( must be white to see fluid) Coat hanger , make the proper graduation mark - how , will be the next topic , and you can make your own fabricated tools ........... ? Give that the odd College try !!
Say , however you do it ,once ya get it right , make Coat hanger mark=cold, mark= "at temp" , and mark "hot" . NOW you can quick check CVT. You can fabricate many , like " production-line " and sell'em here and elsewhere to all the potential DIY FUTURE CVT-killer mechanics .