Laurie pointed out the precision factors for the weighing scale and I also briefly thought --- 
is that the conversion?   But it is not the conversion factor.  The number of grams and 
tenths of ounces of precision are merely the lowest potential value that can be measured 
with any degree of precision (not accuracy since this requires calibration).  If you use the 
scale a lot you will notice that it jumps by a factor of 2 for grams and a factor of 1 for 
tenths of ounces.  If you measure an object that weighs 0.1 oz, it will hover for a while and 
settle on either 2 g or 4 g.  If you start measuring heavier objects repeatedly, then you will 
start to see that the averages of these values will approximate the 35.2 g per ounce.  If the 
scale had a precision rating of 1 g, you would probably get a value of 3 g. with a few 1 g 
and 4 g measurements.

Best, Susan 

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