I used pulsar detection techniques to turn a phone into a watch timegrapher

Automated excerpt

At 28,800 BPH you get 8 beats per second, each 125 ms apart, with a full balance wheel oscillation every 250 ms. A watch that's 10 seconds fast per day has beats spaced at 124. 986 ms instead of 125. 000 ms. Two back-to-back sessions with the same watch: one detected zero ticks (1. 5 dB SNR), the other detected 65 ticks (4. 2 dB SNR).

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