Cheap chronograph, worked great 20 years ago, but I’m told they are unreliable now based on new technology.
I have a Similar system, that turned right on and worked after 19 years of no use and had a 9 v battery that was still plugged in.
The new ones are easier to use and track more data, but my Oehler p35 still works well and was rated very well 25 years ago.
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