If I were doing a count without a scanner, I'd either have a laptop I could push on a cart that I could key in the values directly on the count record, or ->
Create a transaction saved search on Inventory Counts.
Have relevant fields ready in the search, Item, Bin, Units, Count QUantity, Count Detail, Memo.
Then I'd go around with a clipboard and count. Then enter the data in the count record at a computer.