Mats did a review of the PS-305D PSU he bought from Smart-Prototyping:
I ran some basic measurements on the PS-305D (Linear 0-30V/0-5A, 1mA Display) I recently bought from Smart-Prototyping.The internal volt meter in the PSU seems reasonably well calibrated.Then I tested the Constant Current capabilities with having a direct short circuit through my DMM. It was very hard to adjust currents below 30mA, but that is expected in short circuit mode. I connected a 12V led bulb with the PSU set at 12.0 volt output. Now the current could be adjusted reasonably well even below 30mAI then set the PSU to 5 volts and connected it to an oscilloscope to see how it behaved during power-on.