Check the listing for details. National Instruments USB-6351 Data Acquisition Device X-Series Multifunction DAQ. Condition: Used. Listed at 1095.00 USD. National Instruments USB-6351 data acquisition device with built-in screw terminal connectivity. Tested, fully functional, and in excellent physical condition. Power supply and USB cable included. 16 AI (16-Bit, 1.25 MS/s), 2 AO (2.86 MS/s), 24 DIO USB Multifunction I/O Device - The USB‑6351 offers analog I/O, digital I/O, and four 32‑bit counters/timers for PWM, encoder, frequency, event counting, and more. Onboard NI‑STC3 timing and synchronization technology delivers advanced timing functionality, including independent analog and digital timing engines and retriggerable measurement tasks. The USB‑6351 is well suited for a broad range of applications, from basic data logging to control and test automation. For additional information, see NI product page.