I wouldn't recommend Xcortech for paintball use. In fact, ANY shoot-through chronograph like that isn't recommended for paintball or real steel use, as the hot gasses from a real gun as well as an exploding paintball could foul the sensors, and cleaning an enclosed tube is a real pain in the butt.
Go with something open, like the Shooting Chrony series. Although, like Darklen said, they are not exactly "portable" in the same sense as most airsoft chronies. So, with that clear, you'll need to define what you would consider to be 'portable'
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