Taking a look at a WITRN-X-MFi USB Power Monitor. 
Combine that with the most complete protocol analysys I have seen until now, and this might well be the most complete UPM in my collection. Check out the video below if you want to learn more about this WITRN-X-MFi.
➤ No coupon code for this one but it's in promo right now; you'll get 6$ off when you add it to your basket.
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