The Keysight 16117B (Agilent) is designed to operate specifically with the 4339A and 4339B. With its wide jaw clips, it is capable of holding DUTs with large terminals. The clips can be replaced probes (Option 001) for measurements of small DUTs such as PC boards or IC sockets. Option 002 enables the construction of simple custom-made test leads. Electrical noise effects are reduced by the employment of shielded-cables. A built-in interlocking circuit enables safe high-voltage measurements.