Are there any unstackable items that output 1 signal strength unit when attached to a comparator?

Solution 1:

There are no non-stackable items that only produce 1 comparator output. This is due to the way that comparators detect items in an inventory.

Comparators work in a different way than you think, they output a signal depending on how full the inventory is. All non-stackable items will make the hopper more full, (5x1=5) making the hopper only need 5 items to be full. If you were to use something that stacks to 64, (5x64=320) you would need 320 items to fill the hopper.

If you would like something that gives only a 1 strength signal, use any stackable item instead.