I have bought GSR-sensors:
That work perfectly fine on the fingers. However, for a DIY project, I would like to measure the resistance on my arm. Thus, I've just connected two electrodes that are distanced 5mm on a wearable textile to the Grove PCB. The PCB cannot sense any variation in the resistance of my arm. I am sure it's due to the high resistance (>50MOhm), as measured with a multimeter.
Is there a way to measure such high resistances? I believe with over 50MOhm, there's simply no way anymore since probably 100MOhm is the absolute maximum.