Using a speed calculator to measure the velocity of your arrows is a great way to become a better archer. You’ll need more than just the device to make the most out of the calculator. You’ll need to invest in a Chronograph to measure your arrow’s speed correctly. Additionally, you’ll need several other pieces of equipment, such as a tripod to hold the Chronograph in place, a target to shoot at, and some measuring tape to measure the distance of your shot.