HDMI signal strength is a function of the Source + Cables + Sink not just the cable alone.
The Cable test units you link to have very limited usefulness - and many of them can be easily 'blown'* if you inadvertently connect to a cable with a 'live' source on the ‘Source’ end of the HDMI cable!
*And uneconomical to repair if you do pop them!
Octava Inc. Multi-cast HD over LAN solutions for Residential and Commercial installations.
I used a similar product when we installed CAT-6 in a conduit to extend our connections. It basically shows if the wiring scheme was connected properly but nothing about throughput or quality of connection.