I have been an HVAC specialist for over 20 years. While I think there is a place for digital gauges, I'm sticking with the old school. I buy my gauges knowing that, along with the expected replacement of seals and hoses over time, I expect years of use with proper care. This is my very first purchase of this particular brand and I have to say that before I bought it I couldn't get hold of it, I was a little concerned. I was very happy with the quality, overall feel and smoothness of these sensors. The valves are smooth as silk and the sensors themselves are of very good quality.