Voltage too high from Ring plug-in adapter?

Hi, I am attempting to install a new Ring Pro 2 hardwired unit. I've bought a Ring brand plug-in adapter/transformer to power it. When I plugged the adapter in and checked the voltage with a multimeter, I am getting ~50 volts AC. It should be 24 volts output, right? I am afraid to hook it up to the doorbell for fear I may damage it. Is the adapter defective, or is it normal for it to be be reading around 50 volts, though the nominal voltage is 24?