A few numbers actually matter when you're shopping.

• Kettle capacity: 1 liter is plenty for a couple of cups. You don't need a giant kettle.
• Scale precision: Look for 0.1g increments. That's enough for consistent brews. You don't need lab-grade accuracy.
• Dripper size: 02 size is the standard—fits 1–4 cups. More than enough for most people.
• Filter type: Make sure the filters match your dripper. V60 uses cone filters with a seam, Kalita uses flat-bottomed ones. Getting this wrong is a common mistake.

These specs make a real difference in your daily routine. The rest is marketing.