Hi, I'm trying to reuse an open hardware soil moisture sensor: [https://easyeda\.com/oshw/Soil\_Moisture\_Sensor\_Open\_hardware\-dpGYSa4mE](https://easyeda.com/oshw/Soil_Moisture_Sensor_Open_hardware-dpGYSa4mE) The two electrodes must be electrically in contact with the soil to work properly When opening the pcb file, I see that the electrode is designed with copper regions, but given my limited knowledge, I thought that they are covered by an insulated layer. Thank you in advance for the clarification.