The Keysight 3446GPBU GPIB Interface Module Upgrade is a versatile connectivity solution designed specifically for Truevolt Digital Multimeters and 33600A Series Trueform Waveform Generators. This user-installable module enables GPIB communication capabilities for compatible instruments, including the 34460A, 34461A, 34465A, and 34470A Truevolt DMMs. The module features a robust D-sub connector interface and comes with a durable metal faceplate for secure installation. Perfect for laboratory and testing environments where GPIB communication protocol is required, this upgrade module seamlessly integrates with existing measurement systems. The plug-and-play design allows for straightforward installation, while the professional-grade construction ensures reliable data communication. This interface module is an essential upgrade for professionals looking to enhance their instrument's connectivity options and integrate their Keysight equipment into automated test systems using the industry-standard GPIB protocol.