I have seen comments on the vac gauges that are seen on Ebay for around $25 for a set and how the quality may not be up to snuff. Well, I broke down and bought a set of those because the price of hi quality gauges were not in my pocketbook range. The gauges are somewhat generic but not of terrible quality. I got extra hose and some aquarium airhose adjustable valves and fitted the whole assembly together where I could check calibration of both gauges on one cyl to see if their readings were even, and they were. I did insert an adjustable valve in each line going directly to each gauge to serve as a needle damper and that worked well. All in all I am pleased for the money involved.