Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
The fork is very well made. It is not made of aluminium as advertised, but from stainless steel, but that's good, as aluminium would be easy to distort and lose its acoustic properties.
There are no scratches on the surface.
There are really no cons with this instrument.
Tuning forks are typically standardized and measured at 20°C and exactly 1 atmosphere of air pressure, so I'm not sure if this is the result of measuring at 26°C and ~1018 hPa - the tone is not 440 Hz, but it's closer to 441 Hz.
To back up the measuring, I've tried to induce the resonation by exposing it to a 440 and 441 Hz, respectively, made by software tone generator. It resonates at the latter.
When held properly with your fingers and struck with a solid object, the fork gives off its basic harmonic, one harmonic at f2 and several quickly fading tones, with the one at 2975 ±0.5 Hz being the longest lasting (~2.3s). That's completely expected, and can be somewhat minimized by placing the fork against a solid surface resonating box.
Whether you need an old school musical instrument tuning device, or a device for demonstrating scientific principles, buy it. You won't regret it.
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