What's your "secret sauce" tool?

Time to share some wisdom.

In a nutshell, what's a tool or item you have in your toolbag that just makes everything a bit better or easier, yet might not be a typical HVAC tool? I know some of y'all have got some weird ones!

For me, I've always kept a magnetic bowl when doing maintenance and service. Having a dedicated place to keep those panel screws secure is a lifesaver.