The National Instruments PXI-6123 Multifunction I/O Module (Part Number: 779181-01) is a versatile device designed for high-performance data acquisition applications. This module features eight analog input channels with a maximum sampling rate of 500 kS/s per channel and a 16-bit resolution, ensuring accurate data collection across multiple inputs. Additionally, it includes eight digital I/O channels and two up/down counters, while it does not offer analog output channels. The module is characterized by an absolute accuracy of 4.96 mV within the ±10 V range, with a recommended warm-up time of 15 minutes for optimal performance and a two-year calibration interval, with specifications guaranteed throughout this period. The PXI-6123 is equipped with NI-STC3 timing technology, offering I/O customization options and programmable input gains to enhance resolution. Self-calibration is efficiently managed through NI-DAQmx, enabling compensation for nonlinearity, offset, and gain errors in just seconds. The module is complemented by a robust NI-DAQmx driver that provides seamless integration with various programming environments, including C, C#, Python, and LabVIEW, facilitating user application development without the need for manual function wrapping. Extensive documentation and example programs are also available through the driver to assist users. The PXI-6123 has achieved Mature Status, indicating its continued availability for purchase and repair through Apex Waves, although it is not recommended for new designs. With its comprehensive set of features and supported by a reliable driver, the PXI-6123 remains an excellent choice for established data acquisition needs.