The Ophir IS JUST A SENSOR!
Like I said, it has its usefulness all by itself, as you can wire it to 2 9Vs and a DMM and have that be your METER. It's low tech, but accurate.
What that lacks is data logging. That's what an LPM is for. You've had several systems mentioned already.
You can buy a meter by itself to tie it with whatever sensor you want. eg: Ophir, TEC, etc. You have various choices in meters that work with different sensors, which you can buy together as a package, or piece it together as you see fit.
Since you say you're only interested in avoiding getting screwed on a laser, a whole LPM system is more than you need. An Ophir would work for what you want it for, and be expandable when you want.