A nice touch is that Dayton relays come with good instructions that don't overwhelm you with jargon.
Dayton 5YP80 General Purpose Plug-In Relay w/ 2-M4X20 Socket Base
I like how the auto-off kicks in after a set time, keeping things simple and worry-free.
You will find that Dayton relays are easy to test with basic tools you probably keep on hand.