What is a LabJack?
LabJacks are USB/Ethernet based measurement and automation devices which provide analog inputs/outputs, digital inputs/outputs, and more. LabJacks provide an easy to use interface between computers and the physical world.
LabJacks are USB/Ethernet based measurement and automation devices which provide analog inputs/outputs, digital inputs/outputs, and more. LabJacks provide an easy to use interface between computers and the physical world.
The team at LabJack is driven to make measurement and automation simple and affordable. Located in Lakewood, Colorado, LabJack Corporation builds great hardware and software for industry, government, and education.
LabJack writes drivers for Windows, Linux, and Mac OS X, plus example code in dozens of languages.
Have a question or problem? LabJack engages in active customer support. You can find answers in the support area and FAQ, or contact us so we can help.

Comments
#1
" . . .which provide analog inputs/outputs . . ."
The question is so fundamental you thought it was understood.
Provides I/O to what?
Do these devices only communicate with computers running monitor/control software? Or can they exchange data among themselves without computer supervision?
Can I plug one of these devices to my ethernet jack in room A and another to my ethernet jack in room B? And have unit B respond to the stimulus from room A? And vice versa?
#2
They provide a link between the real world and software running on some host computer. The U12/U3/U6/UE9 cannot do what you describe by themselves, as without software on a computer somewhere they do very little.
A way to do what you describe would be to take a Linux SBC such as the TS-7500 and connect it to a U3. This gives you a networkable and programmable Linux computer with real-world I/O.