I'd been looking for a decent chronograph to test modified blasters out, and this does everything I need it to. It's small, easy to set up, consistent, and has a host of great features. You can preset size and weight for up to six ammo types, allowing you to better compare blasters that shoot different ammo, such as Elite, Mega and Rival, by measuring kinetic energy of each. It can give you rate of fire readings for full-auto blasters, it can record multiple values and show the average, maximum and minimum, units are changeable to whatever you need them to be, and the battery lasts a very long time, even longer when you set the auto-power-off to just a few minutes. I've had it for a few months and have only had to charge it twice. It's not quite as precise or accurate as something like a Caldwell, but it's much cheaper than a Caldwell and most other go-to chronographs that people use for Nerf. One particular thing I like about this one is that the input side is almost the same size as an N-Strike barrel lug, so you can fit most blasters in the front of it and position the barrel right in front of the sensors. It does have a mobile app, allowing you to connect your smartphone to it via Bluetooth, but I haven't used it all that much because everything I need can be done directly through the chronograph itself. My only gripe is that, because it's so short, it sometimes double-reads Mega darts because they're relatively long and can hit both sensors at once. This is a real nitpick though, everything else it does flawlessly for the price point.