I know I have posted before about not using things for a long time. Like not using meters, vacuums, corona wire, etc. Just realized today I haven't used a test chart but maybe 3 times the whole year. I'll print test pages and use them.
Does anyone else want to add what isn't being used as much in the copier repair industry anymore, tools, chemicals, etc:
I'll start the list with has already been mentioned,
vacuum
meter
corona wire
test charts
Bookmarks