What is the test output for?

[DFliyerz]

I have this bench power supply, and have been using it for experimenting with electrolysis. I didn't pay much attention to this part when I got it, but I'm now wondering what the "test" positive output does, and if it simply produces a massive 200V DC. Please help!

[Kappes Buur]

To test an external voltage source (eg: battery).
Mind the polarity, though.