DIY Laser levelling using webcam and laser level

[JAZZCNC]

Maybe read the whole thread mate,

I don't really have a need for it, so my time is better spent doing other stuff, like trying to understand the brain-numbing C++ macro's for an ATC.!!

However, again I'll repeat I wasn't knocking what you are doing or saying anything negative about what you are doing, merely questioning how it's validated, because without validation equipment it's all guesswork, highly educated guesswork probably but still guesswork none the less.
That said I'm sure some will have use for it, hell I may even have use for it someday, so please carry on. My post honestly wasn't to discourage or rubbish what your doing and It's good for everyone who needs it so I applaud you for it.

What is the DIN 876 grade standard of the surface plate you use?

I've got 2 surface plates one BS817 6` x 4` x 10" Grade 0 forgot the name of maker but it's a old one on a metal stand, weighs about as much as a small car. The other is Din 876 made by Insize 9600 series 1000 x 630 x 140 grade 00. The granite triangle is a Mitutoyo Din876 500 x 300 x 60 Grade 00.