I'm curious...I know the Tektronix 4020 has a function that displays power. There must be others, hopefully less $$. My Kiethley 2015 displays dBm and then I convert to watts.
Uni-T UT71E has a power function : UNI-T UT71E Review | Test Meter Pro
Its not cheap though, around $200.
Its not cheap though, around $200.