Looks interesting for anyone thinking about a rig tension meter, I bought a Loos Professional off the forum for sale thread about ten years ago which I am happy with, but if I was in the market for one I would certainly consider it.
I have had one for a couple of years and been very happy with it, if you do adjust your rig regularly it is definitely easier to use than the traditional loose gauges, but as mentioned above it does use a different scale but there are conversion charts to switch the traditional loos gauge values over to it.