[USMA:29182] conversions

[Predrag Lezaic]

I have been using this site 
http://www.sciencemadesimple.net/EASYweight.html to convert grams 
-ounces etc but was surprised when I had a choice between troy or 
avoirdupois ounces. What the heck is this? Like one is not complicated 
enough. It turns out that products that I am importing from europe are 
using avoirdupois conversio.

Thanks,
Predrag