★★★★★ Review: Bug Hunter Expert. BH-03, RF Signal Detector Anti Spy Bug Detector

You can pick one up on Amazon here: https://amzn.to/2KdUgxy
It's made by i4 Technology. They're super cool people.
I use this when traveling. I am in a lot of hotel rooms.
I test this multiple times and it does in fact pick up frequencies that are associated with bugs. Just note in this world of technology you're going to have a lot of false positives as you're stumbling into wifi and microwaves.

But the good news is, it does work and it's fairly easy to operate.
★
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Original review from Beau Chevassus, Knok Studio (Media for non-profits), http://www.knok.org (Seattle nonprofit) Knok.org
From Beau Chevassus: http://smile.amazon.com/gp/profile/A1IJUCICSBF7LA

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