2 layers

Ehz diag
e-cite/arduino-ehz-diag
Circuit, PCB and software for a smart meter (EHZ EDL-21) diagnosis tool based on Arduino UNO
14 parts1MIT
KiCad boards from 2 GitHub repositories tagged “edl21”, the most starred first; open any of them in PCBKit.

e-cite/arduino-ehz-diag
Circuit, PCB and software for a smart meter (EHZ EDL-21) diagnosis tool based on Arduino UNO

e-cite/ehz-sensor
Circuit, PCB and software for a 2-channel smart meter (EHZ EDL-21) sensor tool for ESP32 and Arduino UNO