When playing with https://github.com/atc1441/ATC_MiThermometer and Home Assistant I had to figure out MAC address of thermometer. After quite some search search for command line tool or command I ended up with UI application
Bluetility (https://github.com/jnross/Bluetility) is really nice and handy application when playing with small BLE devices.
Installation:
brew install --cask bluetility
Usage: Bluetility is present in your Applications