I have the FX and it is a unrealizable POS. I also have the cheap Amazon that always works.Regards,Roachcreek
Thanks for all the replies i just ordered this one . For $33.42 to my door felt like i could not go to wrong .https://www.ebay.com/itm/US-Chargeable-Ballistic-Chronograph-High-Accuracy-Arrow-Velocity-Meter-Measure/383642319690?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
One of the nice things about these inexpensive units is they work on a different wavelength of light and seem very insensitive to lighting conditions.