https://www.amazon.com/gp/product/B0823M5M6M/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
I think this may be the chrony Deadhorse was refering to , it does work well.
+1 for this muzzle mounted "velocity meter". I have one and it works flawlessly. However, they do only measure in meters per second and the muzzle mounted version only measures in whole meters, not tenths. Even so, I have had no problems with mine and it (any decent chronograph) is mandatory if you want to tune an air gun.
BTW, I do recommend the muzzle mounted version of this chronograph for the ease of use over the stand alone version, even though the stand alone version does measure down to tenths of a meter. Many folks have ended up shooting their stand alone versions by accident. YMMV
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