Pressure gauges that read in a very low range like this one require a different kind of technology which costs more. Being more rare and not produced in large number like the 0-30 and 0-100 also adds to this cost. But quality and accuracy stay high and they provide invaluable information for low pressure applications like our BluSoak and GrowStream system where going from 2 to 3psi can radically change the flow rate. They also take the guesswork out of setting up and dialing in systems. You can put them at the end of a long line of tape/soaker hose and use them to adjust for the best psi to give you the best amount of water flow rate.