Sport sensors radarchron - Sport Sensors ArrowSpeed RADARchron Arrow Archery Radar / velocity sensor

This took two minutes to put together and get on my bow and it was remarkably consistent in the speeds it measured. I shot several weight arrows and the speed groupings for each were amazing.
Pros: Light, easy to use, consistent
Cons: I wish it had an additional extension rod

This review was written in the old system and had content requirements that are different than reviews written today.