Hi Bakis,

I use the
‚Sweep Function Generator with Frequency Counter`
from www.conrad.com (a cheap mail-order house!).

The Frequency Counter measures from 2 to 100000 Hz.
For more informations go to the International-Site at Conrad and
search for the Item-No.:
123110-92

For tuning-informations (notes, octave range, cent-detuning) I use a
chromatic tuner (Korg AT-12).

Another possibility is measurement with software: record a tone and
measure them (for example) with WaveLab.

By the way: In WaveLab there is an oscilloscope (the scopion-PlugIn).
A big oscilloscope is in samplitude (www.sekd.de). You can use this
oscilloscope with the demo-software!

Josef