Anyone try the cheap Chronographs from Ebay and Amazon?

Anyone know about this one? Aliexpress

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I'm new to the whole PCP game. I got one but the only thing I'm using it for is to dial in my hammer spring to find the best FPS for one of three pellets I use. I also validated this cheaply Chrono against two others that considerably more expensive and mine was with in one or two FPS. What else can I use this for.
Anything that flies🥴
 
Anyone try these inexpensive chronographs that are $35? I'm not planning on tuning very often. I just need to tune for slugs. I've seen some youtube videos and a few positive post. Just wondering if anyone has compared one to a more expensive chronograph. Are they accurate, and consistant? Looks like there not going to be the most durable for I wont be using it very much. I already have a chosen pellet I just need to figure out what slugs it likes. View attachment 339427
YES got one @$14 and it works perfectly , If your only interest is FPS or MPS . and there is math to take care of most other results .
 
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