Barista Progear Calibrated Tamper 58.3mmTamping coffee is another important variable in your espresso preparation, with every barista having their own technique and pressure you can get a range of different results even when using the same coffee and brew recipe. A Calibrated Coffee Tamper has a spring loaded base that has been engineered to deliver 30 pounds of pressure consistently. This consistent pressure paired with the 58. 3mm base gives you the best chances of making great tasting