Hi McT
Right, forget the rika, the scatt is the better of the two for a number of reasons.
The scatt uses an optical sensor much like a laser that sits underneath the cylinder of the pistol attached via a band - the sensor also picks up acoustic signals (from the trigger) so that it 'knows' when a shot has been released. The sensor then connects back to the computer via usb. A separate cable runs to the target holder which is basically a hollow plastic square that hold the target - you can live fire, but I would only recommend this if you know you get 100 of your hits in the black ......the sensors are expensive to replace if shot! You don't need a trigger sensor.
The scatt is useful if you are a 550 shooter or above as it picks out things like hold point, raise and time on target etc. I had one for a while but the West Midlands Squad has three so when I train I use that one.
Hope this helps
Lee
Please tear carefully along the perforation.