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Uncle Doug is very good, Amp Bias Part 1: https://youtu.be/w9B0Rhr_Y-E Amp Bias Part 2: https://youtu.be/pjKYiSr497w

http://www.duncanamps.com/technical/lvbias.html I typically follow the Cathode Resistor Method there may be other helpful bias info online.

I don't own one so, I cannot recommend a particular model. Many use them, I don't trust them. I take the readings myself "Fluke" n calculate

Hi would you recommend getting a bias probe? I would like to know if they are genuinely useful as looking at how to get current as a process only requires some fairly basic electronic calculations and a few readings.