I use this Tom, lots of fakes about, so buy from a reputable source or direct. I have their depth gauges and callipers as well. My dads old imperial stuff was Mitutoyo as well. They do have much more expensive ones costing 1000s, but mine is guaranteed to +/-2 Micron and that’s all I need
https://shop.mitutoyo.co.uk/web/mitutoyo/en_GB/mitutoyo/1305876921890/Digital%20Micrometer/$catalogue/mitutoyoData/PR/293-821-30/index.xhtml
P.S. If you do buy one be careful of a few things (not sure it’s in manual, but any good engineer knows this….as you can see my jaws are not fully closed, this is so changes in temperature don’t strain anything. Micrometers must never be stored with the jaws fully closed.
Also when measuring, try and hold by the plastic with your left hand, this minimises the temperature effects as they might warm up and avoid handling the workpiece too much. The older style engineers 1 handed usage works, but for best accuracy avoid touching more metal than you have to.