The goal of this research is not only to produce the experiment tool to learn Ohm's Law but also to train the High order thinking skills of the students through the experiment activity. The procedure in making the experiment tool of Ohm's law consists of three steps, which are planning, making and testing and all the aspect of High Order Thinking Skill (HOTS) appears in these steps. In planning, we more focused on analyzing and creating. In making process, we used the laser to prevent the apparatus from broken and giving the good appearance. Finally, at the last process (testing process) we have to make sure that the apparatus can be used by the students to prove the Ohm's law. Based on the testing process, proved that the tools can be used to prove the Ohm's law and can improve the High order thinking of the students.