Looking for ptg calibration disks

[BTLew81]

I have an older ptg that works well enough for me. However, I lost the calibration disk. Does anyone know where I can get one or have one they could sell me?

Thanks.

[BTLew81]

Would even borrow one and pay all shipping.

[AGOatemywallet]

Coating Thickness Standards - Certified and Non-Certified (http://www.defelsko.com/standards/coating-thickness-standards.htm)