So I've had a few of these tools for a while now, thought it would be good to share with the DIY's here in our midst, all fuse/electrical related.
First is the off-vehicle relay tester: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Works very well but this in the link is woefully cheap cost-wise however the long term durability is quite unknown to me. There are similar better possibly higher quality devices to be bought but if this would live in your at-home toolbox it should last a long time.
Despite this silly name "fuse buddy" devices from this outfit have served me well for a few years now, especially during the sometimes complex build outs I tend to create for my electrical systems. This is the biggest capacity version they make: Electronic Specialties Inc. Professional hand held automotive test equipment. MODEL #315 MAX FUSE BUDDYâ„¢ KIT
Another in the "fuse buddy" line up, the lesser capacity version I recently acquired: Electronic Specialties Inc. Professional hand held automotive test equipment. #309A Fuse Buddy Mini Kit-IMPROVED
Honestly this one would probably serve most DIY's the best unless you're dealing with higher amperages or the Maxi Fuse sizes commonly found under the hood or perhaps in an upfitter's add-on auxiliary fuse boxes.
Don't let the prices shown on the company webpage scare you off--Amazon and eBay both have better prices.
The greatest thing about those types devices is they're direct reading and allow amp draws to be known without using a DMM that's typically limited by its 10 A internal fuse. I find them much easier to set-up and use, nothing more complicated than installing a fuse.
The site Electronic Specialties has quite a few useful tools---the main page can be accessed from either of those linked device pages.
Next is the IPA Fuse Saver kits, this is the Master Kit which I have and use: https://ipatools.com/product/8016-fu...er-master-kit/
It's a bit of overkill even for me--I found the one I have at a crazy great new price and snatched it up. I don't regret the purchase but sadly its not used as much as the full current new price would justify.
On IPA's site you can also find a few selections of contact & terminal cleaners, basically wire brushes sized for that duty. Here 'tis: https://ipatools.com/product-categor.../contact-care/
These might not be every day tools but for me they fit the bill perfectly for the designed tasks. For the most part they're quality tools, aimed more towards the professional level mechanic which tends to mean they're reliable even with a bit of rough handling.
Hope these are useful!