Took two of size 25mm: 25mm (a) - Have an error of around +0.022mm or +2200%!!! 25mm (b) - Have an error of around +0.015mm or +1500%!! None of the bars are inside the +/-0.001mm accuracy as promised, they are not even in +/-0.01mm accuracy!!! They are useless for calibration without regrinding them!!! Garbage for scrap pile! Seller ignored messages, didn't cooperate. After that seller lied to judge of dispute, that the gauge bars can be measured only by digital calipers! What a deceiving scammer! I strongly do not recommend neither the product nor the cheating, lying seller!
Thank you very much the product came 100% very good