• 48MHz Clock Rate
• 256KB Flash Memory
• 32KB SDRAM
• ATSAMD21E18 32-Bit

The first time you soldered up a surface mount component you may have been surprised "these are really small parts!" and there's a dozen of different names too! QFN, TDFN, SOIC, SOP, J-Lead, what do they mean and how can you tell how big they are? Now you can have a reference board at your fingertips with this snazzy PCB reference ruler. This ruler also features a build in development board with 7 LEDs, 5 GPIO pins, SPI, I2C, and Serial, and 4 capacitive touch pads. Compatible with CircuitPython and Arduino