Exemplary embodiments provide composite materials, methods for making and processing these materials, and systems for using the composite materials. The disclosed composite material (or composite member) can include fiber-like and/or particulate materials incorporated within a binder polymer. For example, the composite member can include fibril-shaped, semi-conductive elements that are contained in a suitable binder polymer to achieve a particular resistance value, wherein the fibrils can be integrated and interlinked in a manner as to create an array of resistive elements that precisely define and control current flows through the related device. The composite member can therefore have resistive characteristics and, none or neglectablely low amount of capacitive or inductive characteristics. The composite member can be used in electric test market, e.g., as high performance, dynamic probes/sensors for very frequency and/or complex mixed-frequency signals.