wild dogman,

IIRC, Mr. Jim Rhea reviewed a very similar looking 'chrono on his YouTube channel, and found it did not function properly.

Whether it was just that one specimen that was duff, I do not know.

The trouble is, that with the messing about that YouTube did WRT airgun videos, the video is no longer on his site

For the same money, you can get the 'Polish' chrono (R2), which I have found to be most exellent, or a Chrony F1, both of which have a proven record ?

Have fun & a good Sunday

Best regards

Russ