Is there such a thing as a frequency detector I can buy?
For my first time tuning, is it okay to tune middle octave to precise frequencies if I don’t hear beats? If so, should I tune the middle octave any amount higher so that as the extremes add pressure the tuning “falls” to right?

Steven

There are many, many sites that deal with the question of piano tuning. Most laptop computers in the last few years have a built-in microphone. "TuneLab" is one program that you can download in a trial version that, when loaded into your computer, will give you a FAR MORE PRECISE frequency reading than ANY store-bought tuner. I mean that.

Also, you can't really tune a piano with a guitar tuner, at least, not in a way that will produce satisfying results. Programs like Tunelab are infinitely more precise, and will provide a rough and ready "stretch" tuning that is based on the harmonics of your particular piano. You need that sort of info to do a pro job.

JG
http://pianosociety.com/cms/index.php?section=101
http://webjay.org/by/exposedfifths/welltempered-johnlewisgrant#16039765
http://music.download.com/johngrant/3600-8277_32-100295882.html