Buy a Magnetospeed so you don't have to deal with all the idiosycrasies. Mine has worked very well right out of the box. Set up is not down range and neither is the read out. It stores the information, Average muzzle velocity, Standard Deviation, and Extreme Spread. The new generation works well with large muzzle breaks. I am now very popular at the shooting range.
Best of Luck,
Dave
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