National Instruments NI-9421 C-series 8-Channel Sinking Input

National Instruments NI 9421 Digital Input Module W/ DSUB 8-CH Digital Output

National Instruments NI-9421 C-series 8-Channel 24V Sinking Input cDAQ Module

US Free TAX NEW NI NI-9421 NI 9421 C-series 8-Channel Sinking.

NI‑9421, 24 V, 8-Channel (Sinking Input), 100 µs C Series Digital Module

National Instruments NI-9421 8-Ch 24V Digital Input Module, For Parts/Repair