Can you post a picture of your actual unit? Most of the models like the one above can be set to show both temps and the humidity all at the same time. If your display is different, it would help us to see it, as you likely have a slightly different model. They make a bunch of different ones, and they change them a bit every so often.
As for the accuracy, it is a bit hit and miss with these, although usually the temps are really close. The humidity readings however tend to be around 5-10% off, and if the unit is over a year old the humidity part often fails completely or gets really off. At least that's been my experience with them. I still buy them though, but I like to double check them periodically with known accurate equipment.