Bought a Huma regulator tester in December. When setting up my regulator for my MKI FX Wildcat I was very careful to not go over the recommended 200 bar. As I pressurized the regulator the oil in the gauge started bubbling and the rubber plug on top blew out. Bottom line I sent off an e-mail asking how do I correct the problem and Huub said it should not be doing that and sent me a new gauge. Excellent service! I have installed 3 Huma regulators in different guns and every one of them works flawlessly and are very consistent. Not only are they great products but they have excellent service. I highly recommend Huma regulators and appreciate the good old fashion service!