Checking USB power output

Following on from my brief foray into solar power, I noted that it wasn't easy to measure the power output of the USB adapter.
Amazon offers, for instance <(Amazon.com product link shortened) dp/B06XFZFZX6/>
or
<(Amazon.com product link shortened) B01CVMAK2M/>.
I'm sure some people here have used such things. Does anyone have a recommendation?
Should I be looking for USB 3 capability for the few USB 3 devices I use (none of which are chargeable).
Cheers
Dave R
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AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

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I use one of these with a dummy load ....
https://www.ebay.co.uk/itm/UNI-T-UT658-Digital-USB-Testers-U-Disk-LCB-Device-Analysis-Voltage-Monitor-UP/253221931243?hash=item3af53408eb&enc=AQADAAADQFjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduVfRnfZr8JCUKxUU00sxce1ZGr0imS8SxwPDmxeHu9fdZ2J1j%2BLvDkI6HOLTJdKtQ4FGTxPrpfUhm1zvQ3e%2FA0hz3zPowlyFdHDgpq4LTJWIKX5SDlMbkDQ%2FzWXFSN6z0wi8Iro35p7UhJ23KCNPA22z7DhA52dNrDa88pSjQDRu2h1z1aqGU7koU1J22aC644so%2BhbMvhbl2%2F1aNeHz5u0fDH8mW6Cd0xofDS5%2FAP0Up30jlkfwgTQJqJ%2B8Gyb0HoyDhyu51oCQD00xKpiJ1w2wj%2FXsz9FluQ9aXco0eFa01wjRnIzUEV2SFigYxg8DaaY0hR8%2FMsbt6EgXToEwYLVmNyOj2iDVzBRQfsA0czMPnDwXMcv3aQcS4Uhj5rUqMD5jTugiAVI%2BIXk70ZRM7VGcKdTjVnMkmskBlMpYon%2FXMklkB23%2FuoQr5FLkdyKOXyEDjchYOWBn77%2BxkNB2O9FzJ6yEX%2BYD1xgzUfDPJ%2Fyip%2Bbewn%2BLyJVrF%2BgD4wnnNSJvEpWWSfk9uQ55RBUw9SZCNFRHsry1LfTqpFhdiMawlB4d9azd0eXQeehKm8VR%2FozIPvscpoNEehMFg0cT8Ev0m%2BHmj%2Bg0q9A0oqpTYNXgySXHFYAJG1N9E3DClLF9SjQS99ba5QXEceacdUCmn0%2BCFbRTTMDdCM17DJtxtwOye%2Fr%2FzUNk46a58Efbb22sz%2B1NXUXsJ9VPcD76kUrH9aw4EgEZR%2FLYG4fHOrtR8wVg7FcdtTqQjBTVvsPsiYhG7aUr7GxOBgIogp%2By2UFwg0uhNoN1wk6v2lw0%2F2Xe1ZMgQZHdnMACwfMxFYAasZQs1VmiB54SDc1Vqby9DFqdULF0CHB53mNQNi9DQnb047VoPnOGW25ahQTm3We4xQVL3WK71NXXiXYbsLxn7IvxUgWnkIqq3jR88vfHPsDOO2qhLVz88ogR%2FC0GLM1BNUGldNY34A9WUEBLmypC81Cid3ZDdLqmGiPrI2G2LwimXWJJ9Gw5jcRZiNl36bKPoAICWTDGhSiplldVN%2FY6yywQT%2BudGtER2qs3GX0pPB6c1eWT8%3D&checksum%32219312438acfa8b088a74dcbba981650db1950ba
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https://www.ebay.co.uk/itm/USB-Isolator-15W-Load-PowerResistor-Power-Battery-Tester-Resistance-1R-9999999R/273008451559?hash=item3f90925fe7:m:mdq02mnxmLoW9bbzs3SoigA
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As fare as I can see usb3 is just the speed. Brian
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On 14/05/2019 17:16, Brian Gaff wrote:

USB 3 can also provide more power.
As standard, USB 2 can provide up to 500mA; USB 3 up to 900mA and special versions for fast charging connected devices, up to 1500mA.
SteveW
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On 14/05/2019 21:58, Steve Walker wrote:

The latest USB 3.1 (IIRC) can supply a lot more than that and at a higher voltage than 5V.
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I saw Big Clive using one of those in a video someone posted here.
Is that a recommendation?
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