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Espresso geeks are always trying to measure and adjust the pressure and temperature of our machines to make better shots. Like the gearhead distinction between theoretical engine horsepower and actual power to the wheels of a car, we don’t always trust the boiler manometer, and want to know what the pressure is right at the portafilter (where the coffee grounds are). This home-made solution should to do the trick for around $25 in parts.
CoffeeSnobs – Home-made Portafilter (PF) Gauge for under $25