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A mutual conductance tester will usually state so on the unit, it was a selling point. They tend to have a few more knobs than emissions testers. An emissions tester is entirely adequate if your checking used tubes to see if they have life lest. MC testers tend to be more sensitive to spotting grid issues that matter in some circuits. There were some proprietary circuits out there that were a bit in-between a true Gm test, and a plain emissions test, usually these were under some kind of trade name that included "conductance" in the title. Often these were a way around Hickock's patent.
pretty much no testers actually applied true working plate voltages to the higher power tube types, you still need to test them in a circuit as a final check.
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