RD TC66/TC66C Type‑C PD trigger USB‑C Voltmeter ammeter voltage 2 way current meter multimeter PD charger battery USB Tester
https://www.aliexpress.com/item/32968303350.html 
https://sigrok.org/wiki/RDTech_TC66C 
https://www.youtube.com/watch?v=rOlhibDUJgs 
bluetooth le range is very losy, it's about 30cm so you almost have to put Android phone on top of TC66C to make it work :‑(
TC66C Reverse Engineering
https://ralimtek.com/reverse%20engineering/software/tc66c‑reverse‑engineering/ 
https://github.com/Ralim/TC66C 
newer version: https://github.com/Ircama/TC66C 
pi@rpi2 ~/TC66C $ git remote -v
origin  https://github.com/Ircama/TC66C (fetch)
origin  https://github.com/Ircama/TC66C (push)
pi@rpi2 ~/TC66C $ git branch -a
* keyboard_mgmt
  master
  remotes/origin/HEAD -> origin/master
  remotes/origin/keyboard_mgmt
  remotes/origin/master

pi@rpi2 ~/TC66C $ sudo apt install python3-curtsies

pi@rpi2 ~/TC66C $ sudo pip3 install bluepy

pi@rpi2 ~/TC66C $ sudo ./scan.py