Written on: 01/02/2005 by haggardpete (10 reviews written)
Compact - take it anywhere
May not be able to mount on some weapons
May be unsuitable for CO2 guns
The CB-625 is a compact chronograph designed to be mounted on the muzzle of an air weapon. Its produced by a UK small company and is not always available, though Ramsbottom's came up trumps for me. It has a very simple design, a plastic oblong case about 6cm*4cm*1. 5cm. The pellet passes along the top of the oblong passing through two plastic hoops which contain sensors. The unit has three buttons, one to show Feet-per-second, one to show Foot-pounds and one to re-set for the next shot. Holding the re-set button takes you into set-up mode where you can change pellet weight or enter a +/-velocity correction factor.
The CB-625 comes with a plastic vee bracket which you fix to the end of the barrel with a rubber band! This is not (quite) as heath robinson as it sounds and for most weapons I have tried it works OK. You do have to be careful and check before each shot that the chrono has not moved. Otherwise you will end up shooting the sensors off. For this reason it is not suitable for permanent mounting. According to the manual you MAY be able obtain replacement parts from the manufacturer.
In use the chrono could be used with three of the four guns I tried it with the exception was a spring pistol with a short barrel. It even fit a carbine rifle with integral muzzle brake.
As far as I could tell the power figures shown for a rifle were about spot on. Used with a Co2 pistol I had very strange readings, I suspect the sensor may sometimes read the speed of the Co2 cloud rather than the pellet. Either that or some CO2 pistols require an FAC
To sum up - at half the price of the next alternative I don't regret having satisfied my curiosity. And it is very portable. But if you shoot a lot or want to test a lot of different weapons another design may be a better bet.
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