Out of left field and maybe out of scope and price, but jump on this site:
https://www.jewellerssupplies.com.au...ulers-calipers
Should come back with a screen full of various options.
These guys sell top quality stuff. Dad bought a slide caliper off them about 20 to 25 years ago and gave it to me a couple of years back when he decided to move to digital.
Digital wasn't for him so he got one of the Mitutoyo slide calipers and says they are excellent. As good as the ones he gave me... I don't know why he didn't just ask for them back.
Unfortunately these guys charge like a wounded bull, but most of their stuff can be found elsewhere for much better prices.
https://www.justtools.com.au/mitutoy...-150mm-530-312
Just thought the page might give you some ideas.