How can I test my microwave oven?
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                            Microwave Performance TestPlace a glass bowl (preferably a 2qt. glass measuring bowl) with 1qt. ...  Heat the water for exactly 2 minutes 30 seconds on High (this is the default setting). A temperature rise in the range of 28-40 degrees Fahrenheit (15-22 degrees Celsius) indicates that the oven is cooking properly. . 
                    
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