If you are building an aircraft, you will have numerous occasions for needing 
                                    accurate measurements
                                    . This might include determining the thickness of a metal skin, the length and diameter of a bolt, the size of rivets, the proper ridge on a step drill for a hole. Making many of these precise measurements can be easily accomplished with a 
                                    modern, inexpensive, electronic digital caliper.
                                   
                                   
                                    
                                   
                                   
                                    This week's TIP demonstrates the manner in which a caliper can be used to make these common aircraft building measurements. A discussion of the 
                                    features you should consider
                                     as well as where to buy this tool is highlighted. Watch and decide if you should 
                                    add this tool to your workbench
                                    .