I fit a DA Retro switchless region free mod to a PAL Mega Drive, with a tri-colour LED and no toggle switches, then see how much 60Hz really changes.
An Atari 65XE showing only black and white gets its colour back after a quick diagnosis and a PAL colour crystal replacement.
A $17 junk Bandai WonderSwan had a burnt polariser and an almost invisible screen. I strip the old film, clean the LCD and fit a new polariser cut on a Cricut.
A budget smart multimeter with a big 3.5 inch screen, tested on the jobs I actually do at the bench every day.