Review on United Scientific GLP3X2 P Streak Height by Ken Hamdan

I was asked to submit a program on rocks and minerals. Whenever I've done this before, I've had access to glass scratch plates and streak plates, as well as HCl to demonstrate how to test minerals. But now I had to buy my own. These worked well and arrived safely. I don't know why they are marked as glass plates with stripes. These are glass scratch plates.