Hello.
I'm Seungseok Choi.
I work for Avanstrate Korea in south Korea.
We are using PSL for inspection calibration.
I'm wondering about the conditions of the validity period of PSL.
Is the expiration date of PSL from the time it opens?
I'd like to get your opinion as soon as possible.
Thank you.
My e-mail address : seungseok.choi@avanstrate.com