Chronographs, which one is right ?

[El_Teacher]

I always wondered if the readings were accurate in the chronographs, so place two chronys together and make a few shots with my friends with three different rifles, First one a BSA cal.22 with 16 grains JSB pellets, the second a Marauder .22 with same rifle pellets and the last one Hatsan AT44 .25 with JSB pellet and this was the results of what recorded the chronographs.



















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Should i buy another one ?
Regards
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[bill_dd97]

What method did you use to insure all sensors are on the exact same axis? Did you switch position of the chronos and retest? Did you calculate fps drop for the separation between the chronos? I noticed both units are in the shade. What effect does the reduction in light have on the sensors of each model?