The HP Agilent 16048D is a used Test Lead.
Other Info:The Agilent HP 16048D Test Lead extends the measurement port with a 4 terminal-pair configuration. It is provided with a BNC female connector board to allow the attachment of user-fabricated test fixtures. Frequency range is dc to 15MHz, DC Bias is -300 V to +300 V. 1.89 m in length with BNC connectors.