The first time you soldered up a surface mount component you may have been surprised "these are really small parts!" and there's dozens 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.  https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2021-04-06 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2021-08-13 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2021-08-19 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2021-11-25 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2021-11-30 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-08-17 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-09-01 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-10-14 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-10-21 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-11-20 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2022-12-01 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2023-03-13 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2023-03-14 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2023-03-15 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2023-03-16 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2024-07-10 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2024-08-04 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2025-02-22 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2025-03-03 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2026-01-30 https://elecena.pl/product/17498162/adafruit-pcb-ruler-v2-6-quot 2026-02-16