I thought this little gadget might be something I needed. I make my turret tapes on Chairgun but the text size is small enough that I struggle to see my yardage marks without my readers and I can't shoot with them on. I ordered this MK turret magnifier and mounted it on my SIII on my Impact. What a difference... I didn't know what the material used to make the magnifier was but I just assumed aluminum. Turns out that it appears to be a printed item but for $24.99 that's ok. I think that although it works well that I'm going to have be extra careful with it as it's pretty flexible. It does come with two extra lenses which are very thin and flexible. I think they would probably scratch fairly easy too. Here's what they look like on my Impact..
Jimmy
Jimmy