Man, those engineer's squares are great to have. I use them surprisingly often in large and small sizes. For example, setting up the band saw table exactly 90 to the blade, making sure cuts are really square, and to check hand planes sides are square to the bottom.
I no longer buy digital devices that use flat batteries. AAA or nothing, and a dial gauge is plenty precise enough to suit me. My favoite dial guage is from Woodpecker, and I use it from time to time to make sure the slot, blade and fence on the TS are right on.
The one digital tool I don't want to be without is my Wixey digital angle gauge. I replaced my old one with the new model that uses AAA batteries and has a lighted background so it's easier to read. Stick likes another brand better, but I've never used it so can't speak to its utility.
The more I do, the less I accomplish.