The 603AK from KRYTAR is a RF Detector with Frequency 10 MHz to 40 GHz, Max Input Power 23.01 dBm, Max Input Power 0.2 W, Voltage Sensitivity 0 to 0.4 mV/mW, Capacitance 30 pF. Tags: Connectorized, Diode Detector. More details for 603AK can be seen below.