The RX-1M5009KE is a glass sealed Hermetic Resistor with a metal oxide resistive element. This RX-1M Hi-Meg series ultra-high resistance high stability hermetically sealed fixed resistor designed for use in electrometer circuits where a high order of performance is required. This resistor achieves a high degree of accuracy and stability and operates at this high performance level for an extended period of time. By being vacuum sealed in a glass envelope, this Hi-Meg is suitable for ultra-high vacuum applications.