Have a bump on me for an excellent product, but If you have purchased the small pocket FX Crono I suggest you keep hold of your V3. I was thinking of selling my V3 until my pocket FX Crono packet in after a couple of months.
By actually reading the instruction and adjusting the sensitivity of my V3 I have found that it will do everything from my sub12 ftlb air rifles up to my Lads 6.5x284 (3,400 fps).