False bottom perforated mash manifold:
I tried bazooka screens and a custom handbuilt PEX manifold before springing for one of these. Not a single stuck sparge since. A crystal clear lauter only takes 2-3 qts.Refractometer:
I use this to mainly to cut the boil when I've reached target gravity regardless of volume. This isn't ideal for every beer where hop addition timing is more important, but it can help you understand boil off rate better, and make those additions as well.