THE TASTING ESPRESSO - Experience the delightful flavor that a smooth and evenly graded tamp will give your morning espresso shot. Did you know that the tamp is a key factor in espresso taste?. FOOD SAFE STAINLESS STEEL - Your health is our #1 priority.
I bought this tamper because it was calibrated, but turned out this tamper has closer tolerances (width) than most tampers I've used. While most users wouldn't care, I discovered there was little if any grounds built up on the inside of the filter wall after tamping. In the past I would have to lightly tap the side of the portafilter to knock those grounds off the filter wall. This was a real plus for me.
This was true for the 58mm. I can't say it would be true for other sizes.