Brand new 48V 2A 2000 mA center tap AC transformer.
Input is 110V/220V.  Output is 24V + 24V.
You get 48V by using the two YELLOW wires.  The black one would not be used.
If you need 24V you can use one YELLOW and one black wire.
It measures W 60mm (90mm with tab) H 50mm D 50 mm

This is an AC transformer and the output is AC also.
If you need DC you need a power supply not a transformer.
If you try to measure the output using the DC setting in your meter it would not give you a voltage.
You need to set it to AC in order to measure the output voltage.

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