I started out with the RCBS plastic ones. After years of use they started to get a little sloppy from wear +/-.002. I got a Starret micrometer but found it was too slow getting the readings off it. So I bought a Enco ร stainless steel dail caliper. It was faster and checking it aganist my Starret mic it was dead on.
After helping a friend make a couple 100,000 tracer and incendary bullets. Making these bullets from scratch required using calipers allot. Measuring the jacket cups and when they come out of the first point form die,second point form die,core insertion die,tracer pressing die,boatail forming die,etc....... Setting up the dies to make bullets involves measuring a bunch of bullets. Making these bullets and using my friend's new 赨 digital calipers was quicker than using dail calipers.
Needless to say I saw the digital light after this bullet making exspearence.
Midway had their digital calipers on sale(๋) one month so I bought them. Digital is the only way to go very easy to read and it will give you the metric reading with a touch of the metric/inch button. When emailing people that I have met on different bulletin boards that are in Europe or Down under digital calipers are real handy. When talking about cartridges,case,bullet,etc.. measurements all I have to do is grab the digital calipers. Open the calipers to the correct inch measurement and hit the metric/inch button instant metric measurement! No math formulas or conversion charts needed.
Once you go digital you never go back!