Ballistic Precision Chronograph, Slingshot Bullet Bow Velocity Speed Tester with MPS/FPS Joules Readings

For 50 bucks, what else do you want? This does take time to setup, position, cover from direct sunlight and find the sweet spot - closer to the light detectors on the base, if you must, for the smaller projectiles. Oh, and it doesn't interface with the apps, get the readouts from up to 36 detections manually.However, the numbers I got from this device are virtually the same as from Garmin, when I got access to one - incredible simplicity, flexibility and convenience, for 10x price. Suite yourself.

It doesn't work. I followed all the advice from the various reviews, but once mine turns on, it will not detect any motion, despite trying both battery and USB power, adjusting the arms and upper lights, and frankly if I'm supposed to see the lights coming on, I do not.I now see this is a frequently returned item... wish I had noticed that before ordering.UPDATE: I spent another hour fiddling with it, checking that everything was tight, but I never got it working. Based on the reviews around when I did mine, it looks like I lost the game of Amazon roulette. Ruined my weekend and now I have to save up for a Caldwell, which costs over a hundred bucks, but at least it's made properly.Even if I could get a new one sent and it worked, it's been such a hassle that I don't want them to get my money.

Works great for the price, wanted a chrono with a bigger entry so I can through it at 5-25 feet so I don't break my $800 electronic target that has a 400 fps limit at 5 feet. And this chrono seemed true, reading on average actually within .5% of my expensive chronograph, with closest being exactly correct, and farthest being less than 3% in rare occasions. Tested once with airsoft toy. Make sure to set it up correctly, top strips go on with sensors down, and are labeled left and right, so it needs to be assembled correctly. Looked intimidating at first but I had no problem assembling.

For $40 or whatever it was, I wasn't expecting much out of this but I only needed it to get a decent guesstimate of how my paintball gun was performing. Thus far I don't have too many complaints, although the essential Chineseosity of this device clearly shows through when you're assembling it. It's obvious that it's made in a way to ruthlessly cut the price point, but it does indeed work.For instance, the arms that hold the upper LED strips on screw onto some threaded rods that are quite simply put through the casing and bent to give them their angle, like someone at the factory just grabbed them and tweaked them by hand with a pair of pliers. It works fine, but looks decidedly janky. The LED strips are powered by way of sending current through the metal uprights; screwing them on solidly is essential to making the thing work. The mounting screws appear to be commodity fine thread computer case screws, and the couplings on the uprights are clearly just jelly bean motherboard standoffs. Whatever; it all fits together and functions just fine.In the box you get one spare upright and one spare LED strip, presumably in case either A) one of them turns out to be a dud, or B) you manage to shoot one off.I found the electronics are quite sensitive to voltage and the unit is not at all happy with the 1.2v input voltage of NiMh rechargable cells. It works fine with alkaline batteries or those zooty regulated-to-1.5 lithium not-quite-AA cells. The display is a simple white led 7 segment arrangement which the description calls an "HD" display. You keep using that word. I don't think it means what you think it means.I will echo the other users' sentiments here that the user interface is more than a bit cryptic and the manual makes absolutely NO sense. The device boots up by default into meters-per-second despite showing "FPS" on the display. You have a very brief window of opportunity immediately after power on to press the bottom square button which will toggle to feet-per-second, which makes the display flash "FPS" rather than showing it solid. See, it's TOTALLY clear and intuitive... Really, the goofy user interface is the only issue I have with this. It seems to me it could have been made much less stupid than it is for no cost other than a slight reprogramming of whatever cheap off-the-shelf microcontroller is surely inside this thing.Anyway, you fling a projectile through and it'll show how fast it reckons it went on the screen. You can configure how long the number stays up but by default it'll clear automatically after 3 or 4 seconds so don't dawdle in writing it down. The unit forgets any configuration you did the instant you power it off and doesn't remember a single setting, so you'd either better be happy with the defaults or git gud at reconfiguring it every time you power it on. Overall it seems accurate enough to me. The numbers it gave me seem plausible for my paintball gun (280 FPS or so) and my air rifle (1100 FPS or so) but I haven't tried to put an actual rifle bullet through it yet. I can say it will read down to exceptionally slow objects, i.e. if you hold it vertically and just drop something through it you can make it read single digit FPS values. Jury's out on extremely fast objects, at the opposite end of the spectrum.There's basically nothing inside the casing so it's extremely lightweight and probably prone to being knocked over in the wind. There is indeed a standard 1/4-20 tripod thread on the bottom if you want to mount it to a cheap camera tripod, or you could just put a brick on it. The only requirement is that you don't cover the windows over the infrared receivers towards either end.Apparently in bright sunlight you may need to fashion some kind of shade for it, but I've not yet had that issue. I figure you could just drape or tape a piece of cardboard over it or something.