DYMO Rhino 4200 Industrial Label Maker

When I take something apart, I like to use labels to mark how things should go back together. When I take a connection apart, I mark both parts. This way I am less likely to make an error on reassembly.

I had tried consumer grade label makers but the problem was that the labels would degrade over time or when exposed to weather. 

This label maker using vinyl labels does not suffer from that problem. It's expensive, but in my use case has proven to be a very valuable addition to my tool collection.