You're right...I doublechecked the file of info. I have from my purchases. It
was the PMP graduated cylinders I got that
are certified accurate by Azlon. The PMP beakers' description says they
aren't calibrated.
The 25mL and 50mL beakers are nearly spot-on when using a graduated cylinder to doublecheck their accuracy. However, I haven't gotten around to measuring the accuracy of the 250mL, 500mL, and 2000mL beakers yet though, with the graduated cylinders, as I haven't used any of them for DIY
yet. Would imagine that the larger the size the more noticeable it might be though.
ETA: I know how you feel knowing you have something in quantity and yet can't seem to find it!

I have 300 little 3mL dropper bottles that I ordered to give samples of flavorings to new local DIYers, and can't find them. Broke down and ordered just another 100. Still haven't found the original ones yet!