The purpose of this research designed to: (1) develop sensor trainers that fit the needs of control system subjects (2) develop sensor trainer with good performance. and (3) test the feasibility of sensor miner as media learning for control system learning at Surabaya Merchant Marine Polytechnic. This study was a Research and Development (R&D) in the field of education. The developmen... https://parisnaturalfoodes.shop/product-category/colloidal-silicea/