Hi all.
Yesterday, while I was using my 33S, I noticed a little speck (dust) on the display. So, as I removed it by lightly touching my finger to the display, like a sponge, I could remove the spec. As I did this, by the lit RPN annunciator, a black smudge (like ink or LCD material) appeared and dissipated.
Has anyone experienced this? What is it and what does it mean?