Hello, @Dom_Stenson!
Just a couple of questions! Do you want to get an specific item from a list, or the whole list and check every row to see if a field has a value that's equal to zero?
If the first question is correct, then I'd suggest using "Get Item" with the name of the specific item. If the second one is correct, then you'd have to use an Apply to Each (which is similar to a foreach) this will go through every single item of that list, and you can add a conditional and check if "field name" equals 0. That's up to how you want to build the logic! Let me know if this gave you an idea!
Cheers!