Rectified tiles or calibrated tiles or standard?

I just learned something new: there are rectified tiles and calibrated tiles (besides "normal" tiles). Have you installed such tiles? If yes, why? Do you have photos?

... Tiles within a manufacturing process can have slight dimensional deviations, in the range of 1-2 mm. [...] However, when laying the tiles, the joints must be left 5mm wide to mask these small differences.
Calibrated tiles, on the other hand, have the same dimension. Because the tiles are measured after production and sorted by caliber. [...]
Rectification means a specific type of edge processing for porcelain stoneware tiles. After production, the tiles [...] are cut precisely to an exactly equal size with 90-degree edges. The exact dimensional accuracy of the rectified tiles makes installation with very narrow joints, approximately 2mm, possible.

Our tiles are calibrated and the grout lines are very thin. The tiler did a clean job. You also don't see any corners that don't fit together anywhere. "Normal" tiles are in my boiler room and the garage.

Exceptionally, below once as a quote, taken from "Baunetz Wissen":
"A calibrated tile has sharp edges and due to the allowed and production-technically unavoidable dimensional tolerances, it is hardly possible to lay it without height offsets on the surface of the covering (so-called overbites). Therefore, tiles are often rectified on the edges after calibration.
This involves 'breaking' the edges or a slight touching up, whereby the upper edge is slightly chamfered all around.
Rectified tiles naturally show a grinding contour on the upper edge, which can vary in intensity depending on the manufacturer."
(End of quote)

So it is useless, rather nonsensical, to want to receive a photo of rectified tiles!
Because one cannot visually recognize anything in photos, but will only be able to detect the difference to non-rectified tiles in practice by slight height differences on the tile or slab edges and/or by haptically feeling uniform edge beveling.
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Best regards: KlaRa

...yes, Bieber. We also have the rectified ones. 60x60. They were not available otherwise.

What was interesting, the installation was significantly more expensive and since anhydrite screed was used, the tiler insisted on impregnating the floor.

All quite elaborate but perfectly clean work.

Best regards Jens

As for the "impregnation" of a calcium sulfate surface: That is definitely a misunderstanding! Because neither cement screeds nor calcium sulfate screeds are "impregnated" and according to the definition, impregnation is supposed to protect against water. Rather, the correct procedure is that screed surfaces are primed after a cleaning grind and then filled to achieve a uniformly absorbent surface. But this is neither complicated nor special. It is a necessary, common measure before laying floor coverings, and thus also ceramic tiles and slabs! And it has absolutely nothing to do with the type of screed binder (here: calcium sulfate binder)!
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Best regards: KlaRa

..thank you KlaRa, those are convincing words.

The tiler said that anhydrite screed absorbs moisture. To create a load-bearing substrate, the floor had to be ground and impregnated. That's what he said.

That it is a primer, OK.
It's complicated because in the 8-family house we had the only tiler who did that...

Best regards