Because of their long wavelengths, compared to the visible and infrared, microwaves have special properties that are important for remote sensing.
There are no microwaves or fryers in the restaurant because everything is prepared and served in the healthiest way possible.
Don't rely on the instruction manual because the numbers on there are typically not complete and refer to a series of microwaves instead of a specific model.If you still can't find the model number, look on the box if you have saved it.
For microwaves, Emerson offers a one-year warranty on most of the microwave, except the Magnetron assembly, which is covered for three-years.
If you plan on repairing microwaves often, then you should pick up a Volt-Ohm meter, which is available at almost any hardware store like Lowes, Menards or Ace Hardware.