I developed the Binary Decoder Soldering Kit to use in a class at RIT's makerspace, to teach students how to SMD solder. The kit includes more than 30 1206 SMD components, as well as 3 SOIC packages to practice different soldering techniques on.
Once assembled, the kit serves as a learning tool to help understand base-2 counting systems. Students can enter an 8-bit number using the buttons along the bottom, and the corresponding base-10 number will appear on the screen. There are two additional buttons that allow students to increment and decrement the base-10 number, and watch as the binary changes.