2 layers68.6 × 53.3 mm

Arduino LMeter shield
michpro/Arduino_LMeter_shield
Arduino Inductance Meter shield
33 parts3CERN-OHL-P-2.0
KiCad boards from 2 GitHub repositories tagged “electronics-project”, the most starred first; open any of them in PCBKit.

michpro/Arduino_LMeter_shield
Arduino Inductance Meter shield

michpro/Arduino_OpenTherm_shield
Arduino hardware shield to send and receive data from OpenTherm devices