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In general, a microwave leak detector is an electronic device used on microwave ovens to check for leaks around the door seal. The device "looks for" microwave energy that might be getting past the seals. There are a number of different types ranging from "cheapie" meters to "survey units" that cost hundreds of dollars and should be calibrated yearly.
Leakage of microwave radiation past the door seal in a microwave oven.
used to detect the microwave signal
A microwave detector, also known as a microwave sensor or microwave receiver, is used to detect microwaves. These detectors typically consist of various components such as antennas, waveguides, diodes, and amplifiers that together can sense and measure microwave radiation.
motion detector
A noise detector is a device to use in detecting noise in a certain area or room. Detection device can be set or program accordingly to a desired level of noise or decibels (db) to activate the alarm for the detector,
yes its called a lie detector
The smoke detector.
A device that detects bugs, it is all in the name.
A non coherent detector is a type of device that does not need a receiver carrier to be phase locked to a transmitter carrier. A coherent detector demodulates signals.
There is a device called a radar detector, but it will only detect a radar signal, not police in general.
...The door? The refrigerator/freezer (though it requires a manual interface, in which you take the food out of the freezer and put it in the microwave by hand). Also, the buttons on a microwave might be considered an input device. There is no microwave input device in terms of home computers (with the possible exception of a hack that allowed you to control it via USB or something, but I've never heard of that being done). A cell phone or Blue Tooth device might be considered a "microwave device," or maybe a 3G or 4G device such as an adapter or hub. That frequency range of radio waves is considered microwave energy.