The gold standard of chronographs is Oehler. For over fifty years Oehler has made the instruments used by the government and industry. All Oehler equipment is made to industrial standards for accuracy and reliability. Shooters seeking perfection recognise the quality of Oehler’s chronographs.
That's why we tested the Speedtracker Mach4+ and the Garmin Xero C1 against the gold standard. The results are very interesting.
The raw data:
The Garmin was 7m/sec different on average and the Speedtracker was 0.16m/sec different on average.