Dk instruments, an iso 9001:2000 certified company, is a leading manufacturer of process control instruments. It manufactures and offers the highest-quality, most reliable electronic and electro-mechanical level, pressure, flow and electrical instruments available. The company offers a flow switch, which is a target type unit that works on the magnetic principle of attraction. As the flow causes the flapper to deflect the magnet moves closer to or further away from the switch causing the reed switch to actuate. Switching action is determined by flow and not by pressure. The unique features of reed switch technique is adopted in magnetic switching and uncompromised quality have resulted unparallel reliability.