full conductance test 102/105~105/101~106/109~102/110 % gm (65%)+life test pass! (life check=key feature other testers lack)
our mutual gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test and leak/short check
gm relates to current transfer ability, whereas gain is a signal amplification factor ~ a subtle difference based on actual voltages