a frequency counter
It all depends on what you're measuring the frequency of. From what I have found, you need either a frequency counter, or if it's sound, a CRO
(cathode ray oscilloscope), but a high quality one is extremely expensive, or if you have an iPod touch/iPhone and headphones with a mic, just get an app for it.
Gladometer
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No, because a trombone is around the same frequency of a trumpet.The tuba is (out of my musical Knowledge) the instrument with the lowest frequency
timbre
secondary instruments,as opposed to absolute instruments ,are direct reading type instruments.the value of an electrical quantity can be read directly from the deflection shown on the instruments.deflections on an un-calibrated secondary instrument are not a true measure of the electrical quantites.
The lowest frequency of a musical instrument are produced by 64' organ stops located at Atlantic City organ and also on Sydney City Hall Grand Organ. These stops produces incredible low frequencies in rang of 8 to even 4 Hz.
Instrument which measures d ability of sample to absorb or transmit radiations