It's 2015. Measuring an audio frequency against A=440hz is child's play technologically speaking. Most any device can do it accurately.
I use a free app on my android called PitchLab Lite. It's pretty damn cool IMO. It even has a spectrograph mode which I've found to be a fantastically useful tool for many many things. There's lots of other great apps out there for free as well. But if you need an excuse to spend some money on a dedicated box to do JUST tuning because you are a "professional" and you take this "Studio-work" seriously, then go right ahead.
I know that I only trust results from a TI-86 or better scientific graphing calculator for adding 2+2, so I totally get where you are coming from.
I use a free app on my android called PitchLab Lite. It's pretty damn cool IMO. It even has a spectrograph mode which I've found to be a fantastically useful tool for many many things. There's lots of other great apps out there for free as well. But if you need an excuse to spend some money on a dedicated box to do JUST tuning because you are a "professional" and you take this "Studio-work" seriously, then go right ahead.
I know that I only trust results from a TI-86 or better scientific graphing calculator for adding 2+2, so I totally get where you are coming from.