Trying to find "Difference Checker" node

Hi, 

I saw this node description (https://www.knime.org/files/nodedetails/_testing_Difference_Checker.html) for Difference Checker and I would really like to use it, but I can't find it anywhere? Does anyone know where I can download it? 

Thank you!

It is among the testing nodes, probably in the SDK or development group. (Very useful for testing!)

Found it, thank you!