Hi Charles,
Yes I know these test kits from Mettler Toledo and Loma. I have one of Loma myself.
However there is no certificate or statement coming with this test pieces and neither is there an unique number on it.
After reading GMOs answer, I recalled that when we received the test kit after a training by loma, the spoker told us to use our own test kit, and look carefully at the test kits from companies, because sometimes the bullet was replaced by a bigger one by the company. I thought this was a fairy tale story, just to sell more test kits to us and did not spend any attention to the mentioned issue.
Now, I am wondering..... are these things really happening?