The Chrony F1 is the centerpiece of an expandable system, and it answers my decades old desire to obtain real data on ballistic speeds rather than trusting entirely on published data as an estimate, when I could find it. The F1 can be used both with arrows and bullets, and it is rated to measure speeds from 32-7,000 fps. The chronograph optically detects the passing missile. It seems consistent as long as there is good diffused light above the missile (using the included translucent strips or an overcast sky). If lighting is weak or uneven, the device may err, as is expected in unsuitable conditions. Tilting the F1 somewhat toward the sun, if using it outside, can solve uneven lighting if any problem arises. This product has worked well for me, with no frustration and few failures to measure. Accuracy is apparent in that table data usually agrees fairly well with measured values. The price for the F1 was reasonable, the package is nicely compact, and use is as easy as opening, setting on a tripod between shooting station and target, attaching diffusers, turning it on, shooting, and recording measurements. With only the addition of a 9v battery and a tripod, it is ready to go in outdoor daylight.
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