KitCarlson said Here is test method. https://www.google.com/url?sa=t&source=web&rct=j&url=http://dkgsite.com/index_files/spark%20testing%20article%20062508.pdf&ved=0ahUKEwjXjOPTpoLUAhWq6oMKHWv6AfkQFggcMAA&usg=AFQjCNG72YJQbXPDnSK6YR1yw7YUwB5_rw&sig2=7fKICL1aezkix6HbdV2taw An easy method is weigh them, heavy wins. :) Click to expand...