DIY Laser levelling using webcam and laser level

[devmonkey]

Jazz will need something far more accurate than the cheap rubbish your typical builder will likely have.

My parents neighbour is a highly regarded surveyor, and has many tales to tell about builders and cheap kit. One was a job to do an independent inspection of a private swimming pool, which after being filled with water, had a 4" height difference between ends.
After a bit questioning, it came to light the builder had used a 'precision' laser to do the setting out, as lasers are "accurate" and less hassle than using a basic water level (aka a bit clear hose). Turned out his 'precision' laser was a special from Screwfix that had never been calibrated, but the builder was really pleased with it as it only cost him a couple hundred pound.
As the neighbour highlighted to him, it had just cost him far more than a couple hundred pound, as the whole swimming pool was going to have to be stripped out and redone.

LOL, my swimming pool is within 2-3mm when full and I used a cheap dewalt laser when I pumped the concrete for that, your eyeball can tell 4" at the length of the pool. Anyway you are confusing the pendulum laser alignment error with the optical error, quite different things, surveyors only care about the former. Similarly a window fitter, specifically someone who fits bespoke bi-folds will have a laser scanner for scanning the openings as the units are manufactured to fit.



Still would have required some shimming to attach linear rails rather than sandstone ;-)