I have a 3A version of this supply. In my case, the meter (volt and amp) are pretty accurate. The dial is very sensitive. I ended up adding a second pot on each channel. There are spaces on the front panel. These two pots gave me finer adjustments to the voltage.
I also have the Tekpower TP3005P (single channel, 30 V 5A, digital control). I like this one a lot (with output on/off, a couple of memory for voltage/current). It is also controllable through the USB port.