How do i know if i have an older unit with out the upgrades. I bought mine about 1 year ago from Cabalas. Today while using it with Varget powder it threw several over charges. It seems to weigh accurately when i check it against the RCBS 5-10 scale. Anyway with the over charges i am wondering if i need to have my unit upgraded, if it isnt already. How do i know if mine is an older unit? Thanks Lee