The HP 11945A close-field probe set includes both the 11940A and 11941A probes to provide full coverage from 9kHz to 1GHz. This set is a powerful measurement tool for searching for and eliminating sources of interference.
The HP 11909A preamplifier typically supplied with the probe set is listed as a separate item 437 and is individually anmed HP 9447F OPT H64 Pre-Amplifier.
