Commercial optical chronographs read arrow speed with an error of a couple of per cent ยท What changed https://matteocampagna.com/en/registry/equipment/optical-chronograph-arrow-speed-accuracy Changes to this claim in Matteo Campagna's evidence registry: its status, its year-by-year history, revisions of the page. en-gb "Commercial optical chronographs read arrow speed with an error of a couple of per cent" added to the registry as Reportedhttps://matteocampagna.com/en/registry/equipment/optical-chronograph-arrow-speed-accuracyclaim:cronografi-ottici-errore-velocita:new_claim:2026-09-16:riportatoWed, 16 Sep 2026 08:00:00 GMT