I bought two of these & neither is a laboratory grade power supply as it says on the box.
Although they appear to be a reasonable quality they are in no way accurate, One reads 13 volts when it gives out 12 volts & the other reads about 11 volts & gives out 12 volts.
If I had used the one unit to power a piece of equipment that is 12 volt absolute maximum then it would have been destroyed.
These are assembled in India & appear reasonably good quality components but quality testing & accuracy is poor to say the least.