How To Check If An Oscilloscope Is DC Capable
I have never heard of a scope being sold that doesn't support DC coupling.

Generally when trying to figure out what features a device supports look for a User-manual, if you can't find a user manual look for other documentation like a datasheet, service manual etc. The information most likely will be in there.

In the case of your scope I found.

http://www.hantek.com/Product/Datasheet/DSO5000P_Datasheet.pdf

And as expected I found

Input Coupling AC, DC, GND

So yes it does support measuring DC inputs.