Rangefinding errors are one of the biggest causes of missing that crucial shot. When aiming high or low, your target becomes much smaller, magnifying the effects of wobble and wind. Every bolt starts to drop at a range where you could still be accurate, and it is so easy to be only a few cm's out at 40 - 80 yards. People spend hundreds or even thousands of pounds on their crossbow equipment and, for want of a simple piece of kit, miss shots they should get.
The Rapier 5-700 Rangefinder may not be the cheapest on the market, but being lightweight, so small and with so many added features, we believe it offers the best value out there.