Sodium hypochlorite is corrosive to stainless steel:
https://http://www.bssa.org.uk/topics.php?article=35Brine (which is salt water - Sodium chloride in water) attacks stainless steel as well so Milton liquid is totally unsuitable to disinfect a dermaroller with, because it will attack the stainless steel needles.
The needles would perhaps still be usable, although I suspect they're blunt now.
Scientia seems perhaps like a big company due to their successful search engine tricks, making them appear at the top of most searches for dermarolling topics, but Scientia is in fact owned by a single individual - a seemingly very immature young man from somewhere in SE Asia, based on the content of his emails to us, his illegal behavior in violating Copyright laws and the way he runs his business, and his business registration/site registrations. He has been sending us childish unsolicited emails such as "You are being watched".
He has been stealing our pictures, entire paragraphs of our text and sections of our dermarolling instructions. It has gotten so bad that we had to complain to the web host of one of his many sales websites for gross infringement of our Copyright, and that site was shut down immediately.
All I can say is: Do not buy from him (Scientia).
This person is not knowledgeable about dermaneedling. He is a very shrewd online marketeer, that's all.
Most of the dermaroller vendors out htere have no clue what they're doing, not even many large and "respectable" ones, because those (such as White Lotus) are either firmly rooted in pseudoscience instead of medicine and claim dermarolling can increase breast size etc., or they just don't have a department that does customer support (such as Dr. Roller - they make great rollers but their rollers are just a tiny fraction of the output of a huge faceless corporation so you'll have to rely on a reseller for info and support).
It seems that 99% of anyone selling trendy merchandise such as the quite novel dermaroller is a scammer in some way or another.
It is hard to compete against such internet-savvy people, except on knowledge, dedication, customer service.
But they always dominate the Internet with their army of paid spammers, their search-engine-optimization tricks, their many websites with promises of miracles etc.
They spend all their money and effort on sales, with YouTube videos and professionally designed banner ads everywhere.
They should do their homework instead and read medical literature instead of spamming forums..
We don't advertize, we don't post on forums, we are not marketing experts but we are committed to help our customers achieve results and we stand for our products and service.
We are not always perfect but in such a case as what happened with your rollers, we would immediately refund you and send you a replacement free of charge.
I'm interested what the Scientia guy replied when you asked for a refund due to his incompetent advice?