I have used the Race Chrono app on an old Samsung Phone. Free and rather good. I was usually within . 1 or 2 of the transponders at Manfield. Has sectors, top speeds, optimal lap time. I just velcroed the phone into the Faring out of the rain. Best bang for buck. Coz its free and it works.
https://play.google.com/store/apps/d...rono.app&hl=en
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