The ACM4520 - 01111 from Copper Mountain Technologies is a VNA Calibration Kit with Frequency 100 kHz to 20 GHz, Max Input Power 0.001 W, Operating Temperature 5 to 40 Degree C, Storage temperature -50 to 70 Degree C. Tags: Automatic Calibration Module. More details for ACM4520 - 01111 can be seen below.