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I am tossing up buying an IPhone / Harry's Laptimer Pro or purchasing a Race Technology (UK) DL1 data logger
which will sample at 20htz.
It will be used for race track events where the sample rate is reasonably critical.
As I am not "the sharpest knife in the draw" on this subject, answers in Htz. would be best understood by me.

Cheers,
Tom.