What are those knobs for? Adjusting flow rate? If so that would be nice. Looks like a flow killer but if you have a good pump then who cares. Looks like 1/4" ftp connectors on that model. Accuracy is a little poor. Here is a PDF of that meter.
http://corp.watersurplus.com/techlib...fa&vfb_cat.pdf
I am bidding on a bigger version of the same brand on ebay right now.