I had a pulp measuring whip mounted sideways on a bar nut. Helped me eyeball until trained. Then I bought a processor. Now it comes out exactly the same, every time. And adjustable in 1” increments! (I love burning the short bits that are leftover) I’ve got some customers who were trained to be fussy, so now they ‘need’ 14”, or 15”, or 17”, or heaven help us if we can’t get 18”. Makes it hard to keep ahead on seasoned wood without preorders! I love throwing in a stick that’s an inch or two longer every now and then to the special customers, knowing they’ll be fighting it as their stoves won’t take anything a 1/4” longer than they asked for!