SmallHD's Anti-Glare Screen Protector for 503 UltraBright Monitor is a professional, flexible HTP screen protector that reduces glare while providing scratch and fingerprint protection. It attaches bubble-free and allows for high light transmittance with low haze. Please note, it does not offer impact protection.
To be honest, the plastic that coated my 503 screen when it shipped was a lot more adhesive and smooth. There are glass iPhone screen protectors for $8 on Amazon, would love if there was something like that for the 503. This protector is good only IF you have a fantastic application. Pro-tip, put yours on while sitting down at a table with steady hands, do not try and apply this while on your cart at lunch.