I suspect this has been posted before but here goes anyway:
Thank you, Armchair, for posting this, I don't think it was posted before.
99 euros...strikes me as a pretty good deal.
It doesn't look such a good deal to me. That's the price of a real entry-level timegrapher, with beat error and amplitude readings, probably a more accurate rate reading (see note), and a microphone clamp that keeps the watch in a fixed position.
To use a clip microphone, by the way, is a
good idea, but it is not a
new idea, let alone revolutionary. I learned this trick when a guy called Klaus posted this
Open source timing software #5 in a thread started by me in the watchmaking forum. (By the way, tg comes with beat error, and amplitude, and a calibration function, and full source code access, and it's free.) So might Klaus be the inventor of the Frederique Constant ingenious watch accuracy measuring clip? One should see the date of the patent application, if any...
Calibrel's question about an unbranded version made me think: is it
conceivable that the unbranded version of this gadget might be just the 2euro guitar pickup clip that Klaus bought?
A final note: a smartphone can't time audio with 1ppm accuracy without an external time reference. No matter which app one might use, it can't and it won't. Here is some actual research
An Analysis of Time Drift in Hand-Held Recording Devices (I have no connection with the authors).