For what it's worth, we have a LabRadar for complimentary use at the English Pit Shooting Range. We went through several Chrony's but they all got shot up and were temperamental about light. LabRadars are expensive but sit next on the bench next to the shooter and have other nice features.
Labradar: The new generation of ballistic velocity radar | Labradar
LabRadar (Doppler) Chronograph - Clark County Gun Club, Inc. at English Pit
Labradar: The new generation of ballistic velocity radar | Labradar
LabRadar (Doppler) Chronograph - Clark County Gun Club, Inc. at English Pit