I agree with Darryl. As most of you know I have a Doctor of Nursing degree, I am licensed as a APRN and certified as a Midwife and also as a Drug and...
The Satis SP200, Coburn OCS 25, Optotech, Zeiss, Leybold, Nidek and several others have made them. Sputter coating would be good for a retailer, but...
I would contact the companies and ask. I think you'll find that all or almost all were employed by the manufacturers as service techs or just learned...