The Bagpipe Pressure Gauge is a superb teaching tool. Every piper should be encouraged to use one!
Pressure gauges assist in learning good blowing technique and arm control by providing instant feedback. The gauges are highly responsive and unlike a water manometer you get the complete indication of what you are doing wrong as you do it.
The gauge goes further than just indicating unsteady blowing to show as you play any drop or increase in pressure. It is common for many pipers to increase pressure during faster tunes or drop pressure in slower tunes. Also to vary pressure within tunes that they are not confident playing.
The Bagpipe Pressure Gauge is an invaluable tool that will help pipers at any level.