The only thing I found Gary, was that the marks between were very small and tough to get just right. It was doable and sometimes the red light from my flashlight would cause some glare off the clear plastic housing protecting the needle. The needle tends to bounce a bit after you move the scope, and thus you have to wait for it to stop moving. In reality if you have a wide angle EP, just "search" a little to find the object.

It still works though.