Normally there is a person endowed with this responsability and everything
that goes in and comes out is counted. It helps to have complete
uniform toolboxes. A notepad and some discipline is all it takes.

If you are truly paranoid you can paint the tools with fluorescent paint,
and at the end of the work, turn off the lights and use (an) UV lamp(s).
Any fluorescent shine is trouble, go fetch it. Fluorescent tape and paint
is readily available (see disco supplies although you want something more
durable for tools). The same technique can be used to mark bad parts
during repair. When done check. If it lights up, you have mounted some bad
parts back into the unit. Congratulations (it happens to everyone after
enough sleepless nights and stress).

It all depends on how paranoid this is really.

Peter

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