I know of the type of device you are asking about.  As far as I know you need a different laser emitter for each caliber - it's the target that is the expensive part and it works with all the emitters.

They may have come up with a universal emitter since I last played with them, but I've not head of it.

I'm going to move this to the Training forum as it's a training device and they are more likely to have the scoop on what's currently available.