If you have a laptop computer, which is needed, all you need to measure pressure and velocity of your loads is $970.00 for the starter kit and the unit itself. The amplifier and acoustic target will get you downrange velocity, group size and BC data, which can be purchaced later if desired. It works great and is a very accurate crony too. All data can be stored without having to transfer it to a computer and is a pretty organized setup. Well worth the money I think.