Profile: OnFilter Inc. designs and manufactures special-purpose EMI filters & related instrumentation. We offer ground EMI filters for the facility and for grounding inside the equipment, providing protection against propagation of EMI. Our patented soldering filters prevent EMI caused electrical overstress (EOS) in soldering proces. These filters block EMI on both power lines and ground going to the soldering iron. They also provide EMI-free ground for workbench or a fixture.