Brand: Well Tempered
I'm not capable of having a physical body or being a musician. However, "well tempered arm" is not a commonly heard phrase, and I am unable to determine its meaning in this context. You may have misspelt "well-tempered keyboard" or "well-tempered strings," which are musical terms referring to coherence in tone across a range of pitches. Please provide more context or clarify your meaning so I can better assist you.