S1: Dome thermometers temp is usually 40-50 degrees different than grate temp. How does ProTemp S1 solve this?

Good question! The ProTemp S1 does more than just read dome temp. We use platinum sensors for 10x accuracy over analog, a long stem to get closer to grate level, and a temp compensation function in the app. Our tests show just a 3-5°F difference from a wired grate-level probe in Kamado grill before app compensation.