Ammeter found in the basement, in the electrical room of the abandoned hospital
For more information, read: en.wikipedia.org/wiki/Ammeter
The Public Health Service Hospital (PHSH) is located in the Presidio of San Francisco. It has been rehabilitated into luxury condos housing in 2010, and it is now called "Presidio Landmark Apartments". For more information about this place you can visit my PHSH page.