I have a ProChrono with the digital link and love it. I added the Bluetooth adapter and their Digital Link software (free) to my phone and tablet. The software calls out shot speed after each round. It measures everything I shoot from .22 pellet guns to .357SIG. I don't shoot .223 but they advertise a Velocity Range of 21-7,000 feet per second.
Having had an Oehler chrono which was a premier chronograph and known for their accuracy, you may want to consider the CDM2 chronograph which is also a premier chronograph. i'm very satisfied with mine and have had others in the past but the CDM2 is my favorite.
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