Screen Protector for ZS19 / ZS20
I would suggest that instead of a screen protector, you buy a Clearviewer. This was the suggestion of Eric Ohlson and others on this forum who have ZS's. I have a ZS15 and was given one as a Christmas present. It serves two purposes, 1st it acts as a viewfinder and helps shade in bright sunlight making the screen easier to see and use in composing, and 2nd, when folded, acts as a screen protector. I really like mine. The web-site is www.clearviewer.com
It is rather pricey, but I think very worth the money.