Reusable Snap-Button Electrode (Ag/AgCl) have a 12mm (outer) electrode diameter and 4mm or 8mm (inner) cavity diameter. The depth of the cavity is 2mm. Sensors can be used for a myriad of different applications including EEG, EOG, ECG, EMG and EDA/GSR. Silver-Silver Chloride (Ag/AgCl) electrodes have outstanding electrical properties and are known for their low offset voltage, low noise and stability. These Snap-Button electrodes are reusable, non-toxic and can be cold sterilized.