Your expectation of chronograph accuracy is far too high - as is most peoples. Due to manufacturing tolerances, unless they're live shot calibrated - you're just not going to get the accuracy of the actual pellet speed. You can get 1% shot to shot consistency, but you'll see a higher variance from the actual speeds.
As far as i'm aware - i make the only calibrated Chronograph that is available on the market (that isnt insanely expensive) - every one is live shot tested with our certified master chronographs and is 0.01% accurate, ~1fps @ 1,000 fps.
Also - most dont run the numbers... 1% accuracy at 1,000fps is 10fps!!!
1% sounds super good, but at those higher speeds it's just not enough compared to what most expect.
(there's loads of reasons why, most marketing & some trickery)
Fits on the muzzle, zero space required, registers every shot - sort of a new age combro, but much better software/interface (because its newer tech).
We also have a few adapters specifically for target pistols - Walther LP500 & Steyr Evo 10 & you can print - so can help get you sorted with anything else you need.
