My command
testforblock 0 ~0 0 hopper 0 {Items:0[:{id:339s,Slot:0b,Count:1b,Damage:0s,tag:{RepairCost:1I,display:{Name:Potato A}}}]}
and ofc i am using it on a Command Block, why would i use it from the player when i make an Adventure map?
I know this command line work since i have used it on other places without a costume name. Now, how about my question about the int? =P
Edit: Oh damn i must have been really tiered until now. I see how stupid i am now =(
Thanks for the realization of my stupid mistake...
Edit 2: Nwm i trough double wrong this time. The cords the Hopper is on is 0 0 0 and the Command Block is in the same height.