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[The_Almighty_Bacon_Lord]

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[Ian.M]

It depends. If you short a DC output power adapter through an ammeter, the odds of not damaging the adapter and not blowing the meter fuse aren't in your favour. If its cheap chinese sh-t it mighe even catch fire.  If its high quality amd well designed, it may have foldback current limiting that makes it short-circuit proof but the initial current pulse may still be large enough to blow your meter fuse.  Constant current limited adapters not specifically intended for Lead acid or LiPO battery charging are *RARE*.

OTOH if you connect it to a voltmeter with a FSD greater than the output voltage it will do sweet F.A apart from reading the output voltage

If you want to check the adapter  non-destructively, calculate an appropriate load resistor to draw the rated current (or just under) at the nominal output voltage, and put one with a high enough wattage rating in series with the ammeter.