In article ,   
   Hans Bezemer   wrote:   
      
   >4. The rightmost digit of the "significant digits", even when incorrect   
   >- is part of the significant digits.   
      
   In metal working the implied precision is half of the last digit.   
   If there is a bar over the last digit the precision is a unit   
   If there is a squiggly bar over the last digit the precision is two units.   
   So 1.00 means a precision required is 5 micron.   
      
   This is more significant as the talk of displayed digits after the   
   decimal point.   
      
      
   >Hans Bezemer   
   >   
   >   
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