Alibaba $350.00 – $600.00/ piece |1 piece/pieces https://www.alibaba.com/product-detail/Greentek-Gelfree-S3-EEG-electrode-cap_1600447038357.html Aliexpress US $980.00 1 piece https://www.aliexpress.com/item/1005004771834123.html?spm=a2g0o.productlist.0.0.23ee3c8dIqs0mV&algo_pvid=fafaafab-e5d3-421b-ad5e-e2cf53756533&algo_exp_id=fafaafab-e5d3-421b-ad5e-e2cf53756533-17&pdp_ext_f=%7B%22sku_id%22%3A%2212000030416653159%22%7D&pdp_npi=2%40dis%21USD%21980.0%21980.0%21%21%2112.62%21%21%40210318c916657202208633656e1ed2%2112000030416653159%21sea&curPageLogUid=EKF9QltYxreX Reseller for Greentek Sensors products are very expensive We ask ourselves whether these caps are worth this much. Or if it is better to build such caps ourselves They miss some features we miss Why not to build it ourselves? They …