Sandhill Electronic Caliper = HP71B + 82162A + Fowler Ultra-Cal II

[mfleming]

Start with the caliper itself. Fowler no longer has the Ultra Cal II, but an updated version, Ultra Cal IV can be found here

https://www.fowlerprecision.com/Products...0-412.html

Like most high end calipers it has an RS232C interface. I assume the older model has the true +V/-V voltage swing. Examine and list the chip types if possible and maybe the H/W interface can be reverse engineered for starters.

Lucky dog!