Yes I have one of those. As with most devices now, the on/off switch is just a 'soft' push button rather than a proper click-switch.   That means the device is actually on all the time monitoring the button, so even when not used it is running down the battery.  Almost invariably when you pick it up to use it next, you find the battery has expired. This is something In hate in all modern kit and where possible I fit a proper miniature switch.  Unfortunately the caliper is too small for that so I have to resort to taking the battery out when not in use - which is a complete pain.

My very early Digital Vernier caliper was very power hungry. So after  the third or fourth battery it got put on the shelf and where it stays. My faithful Mitsui Analogue vernier is this on its original battery (but I can't see where it fits)   Roger

Is that one with  "hose tails" as most seem to be face-fit which looks "diificult" On teh plus side I have just ordered an early KA throttle body for £8, purely for the "snail" linkage bit to graft onto the ST170 throttle body. That will save having to make one. been looking at the look.  I need to dig out the "illuminated magnifyer" we have so I can read what each cable says on it. 

This wasn't ChatGPT!

I used an idle valve from a Fiesta, will try to find the part number. I had to modify it so that it closed completely as I think Ford used it to set the idle speed.  

🤣

Not that I’m addicted or anything but this is chatgtp aerodynamics suggestion for my car.    not sure it’ll be allowed in the silhouette rules but a carbon fibre shell ….. hmmm if only there was someone so talented on here that could ………🤔  

Yeah, well, no fingers to get wrong on a TR3…..

I dunno….. had a bit of a poke around on their website earlier.  Some of the prices…… . Would pay to shop around IMO.

There you go. Although I am very happy with my old school vernier vernier calipers. Except nowadays I have to wear glasses to read the vernier part