Does anyone here know much about laser proximity sensors? I'm thinking of the sort of thing which is used in the Leica total stations for surveying, but I don't know a great deal more about them.
I'm looking for something with a range of 1000 mm, a resolution of 0.1 mm, preferably with a digital output and the ability to measure off a reflective metal surface.
The application is a mercury barometer. I've always wanted to build one, and after the thread about boys playing with mercury in West Virginia, I asked a few people about acquiring some. The result is that I've been offered a 76 lb steel flask of mercury for =A330, which sounds like a good deal.
No doubt some people will think I should avoid the mercury. It's interesting the way that mercury ignites such strong opinions. There seem to be two camps of people. Those who think mercury is cool, and those who think mercury is to be avoided at all costs. I'm in the former camp, although I'm aware that I need to be careful with it.
I'd like to build a real showpiece of a barometer, and the digital measuring was just a thought I had. Does anyone know if suitable proximity sensors are available and what they might cost?
Or I guess I could steal a DRO from a mill...