I've tested hundreds of gadgets over the years - these 10 I always keep handy

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I've collected my fair share of multitools and gadgets, but I've lost track of how often I've needed one -- only to realize it's sitting at home or in the car. It's just not practical to carry around a full toolbox everywhere I go. 

What I do have with me almost all the time, though, is my keychain -- and it turns out, it's the perfect way to keep essential tools within reach.

Also: The best $5 I've spent this year is on these breakaway USB-C connectors that overdeliver

My keychain is the one bit of kit I get asked the most questions about. People are often surprised at the things I carry around. I guess most people just carry their keys on their keychains. Weird.

Here's a ...