Calibrated Spring Mechanism: Unlike typical calibrated tampers, our espresso tamper features a spring that doesn't dictate pressure but lets you feel the resistance of your coffee powder, providing a more intuitive tamping experience without the guesswork of when to stop. Graduated Tamping: The tamping depth can be adjusted up to 13mm by rotating the middle ring. This feature ensures uniform tamping pressure for consistent espresso extraction, enhanced coffee flavor and quality. Optimal 30-pound Pressure: This tamper is engineered to apply precise 30 pounds of pressure, ensuring optimal coffee compression, making premium espresso every time you tamp. Constant pressure improves the extraction quality and taste of your espresso.