How to cite instructions supplied with a life science product

I would like to cite instructions which were supplied with a life science research reagent purchased a few years ago. The instructions are available at the link below but the host is not affiliated with supplier and the supplier no longer supplies the product or hosts the instructions.

What would I need to enter into Zotero in order to get an acceptable Chicago style reference in my text and bibliography? It's just for a masters thesis so it won't be getting published.

The information I want to cite is on page 7 under heading "signal to noise ratio".
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