Why are there numbers (1-5) on the chamber of AeroPress Steel if you can’t see the coffee inside?Updated 18 days ago

The number markings are a recognizable part of the AeroPress design and, by including them on Steel, we're protecting our trademark. To help with fill guidance, the inside of the chamber includes a laser-etched mark at the 5 level that can be seen from above. Most people can simply fill the amount of water they want. If you want more consistency, you can measure water with a measuring cup. For the most precise brewing, you can also measure water with a scale. Do not press while the AeroPress is on a scale.