https://www.riflesonly.com/pro-shop/tactical-kit/superchrono.html This is the link to a new chronograph recently tested at Rifles Only. This is an acoustic chronograph that does not depend on lighting or a small reading area. I shot a 308 over it as we'll as +P handgun. This unit read every time. I also tested it down range at the target. I am sold on this unit. It fits in your glove box or pack, has no wires and is intuitively easy to use. Check it out!