I got a few specks of dust on the OLED screen window of my Keysight U1273A multimeter so I gently ran
a clean pad of my finger over it, like I'm used to be doing with my smartphone, tablet, camera screen, watch, calculator - everything with a screen, basically. It ended up with what I initially thought to be smudges so I gently swiped my finger over the screen few more times. It turned out each time I was doing that, the surface of the screen developed a new set of tiny but permanent micro-scratches - see the photo attached. It doesn't impair the display visibility in any way (and, admittedly, doesn't look as bad in real life) but now I've lost a bit of confidence in this gear - if I can damage the display window with my bare skin, what will happen if it actually gets in contact with something hard and pointy, like, I don't know, a wire? I think that's the first time I came across anything like that, almost as if the display window was made out of sugar. In all the years of my usage of digital cameras, smartphones, tablets, you name it, I ridiculed the screen protector films of all sorts and now it seems I'd consider getting one for the first time in my life, for an IP 54, supposedly rugged, industrial-quality multimeter