I’m very fond of gadgets. I have them all. There is something special about whipping out a grand’s worth if gear to demonstrate a concept or idea. Amusingly, that same idea could have been scribble on a napkin with a borrowes pen and the outcome would have been the same.
When it comes to moving an idea from the minds eye to a rough canvas, you can’t beat pen and paper. But you don’t have settle for any old napkin or the backside if recycled printer paper.
If you are feeling eco-friendly then take a stack of old paper that has been printed on one side and print these grids on the other site.