1. Choice of brand and specification: Microwave oven is a product with high technical requirements, so the brand is very important when choosing microwave oven. In terms of specifications, generally speaking, a microwave oven of 650-800 W is enough for a family of 3-4. If you need to cook food quickly in your life, you should choose a microwave oven larger than 800W W W. The power of a microwave oven with barbecue function is generally between1000-2500 W. When choosing, you should consider whether the household electric meter and circuit can withstand it. For example, if the rated current of an electric meter is 5A, its maximum working current is twice that of 10A, and its maximum power is 22 00W(220V× 10A). The microwave oven with output power of 850W and rated power consumption of 1350W can be safely used. If the meter is 3A, it is obviously difficult to use. If other electrical appliances are used at the same time, it will not work at all. The power parameters of the microwave oven must be carefully checked when purchasing, so as not to affect the use because of poor power selection. 2. Selection of product appearance quality: whether there is dust-proof packaging (plastic bag) after unpacking, and whether the packaging is flat and "submissive", so as to verify whether the product is sent directly from the production line to the store. Whether there are instructions and recipes (usually recipes), warranty cards and warranty cards in the outer packaging box. Whether the load-bearing plate (usually glass plate), grill (only available in microwave ovens with "barbecue" function) and other accessories are complete, and whether they are placed in the box or furnace cavity through anti-collision measures. Whether there are obvious scratches on the outer surface of the product and the inner surface of the furnace cavity, and whether the sprayed layer is uniform, flat and smooth. It is necessary to see the product identification plate on the external surface of the product or after opening the oven door. The main contents shall at least include: product name, product trademark, product model, product manufacturer name, rated voltage (220V), rated power (such as 1250W), rated power (50Hz), rated microwave frequency (such as 750W) and rated microwave power (2450w). Some safety precautions should also be seen on the outer surface of the product or after opening the oven door. Signboard appears to be waterproof, clear and wear-resistant, and the adhesion between signboard and product surface is firm. The pattern, scale and handwriting on the control panel should be clear and clearly defined. Turn the timer knob of the electromechanical microwave oven, and there is no obvious sense of stagnation. When turning to the highest or lowest scale position, it must be in place and cannot "cross the line". Set the timer to zero and you can hear a slight bell. No matter whether it is metal or nonmetal, there should be no burrs on the corners of the appearance. 3. Selection of internal quality of products The oven door is an important barrier to prevent microwave leakage, which should be inspected emphatically. When the door is opened and closed for many times, there should be no leakage. According to the common oven door design requirements, after pressing the open button, the oven door should automatically pop open at a certain angle (about15-30). In order to meet this requirement, the oven door should shake slightly after opening, but it should not feel too shaken. There are two common ways to open the oven door: one is to open it directly; A method of opening a door with an opening key. The former should feel that when you open the door, you can open it with a little force; When closing the door, you should also use a little force to close it; When the latter presses the open button hard, the door will pop open and close in the same way as the former. Microwave ovens do not rely on the complete sealing of doors and doorframes to prevent the leakage of microwave ovens. Therefore, after the door is closed, there is a certain gap between the door and the door frame, which can transmit light and leak air. This is normal. But if the gap is too big (for example, a nickel can be put in), it is not normal. In addition, after the door is closed, pushing the door hard will have a slight shaking feeling, but the shaking amount should not be too large. Then, with the help of the inspector, turn on the microwave oven, put a glass of cold water in the oven cavity, close the door, and conduct further inspection and selection according to the following steps: (1) Mechanical microwave oven: set the power regulator to the maximum power position, and the timer pointer points to the position of 10 minute, at which time the microwave oven starts. About 5 minutes, open the oven door and touch the glass. It should be hot or boiling (depending on the power and water volume of the oven). Then adjust the power regulator to the gears of medium power, half power and "unfreeze" respectively, and work for 1-2 minutes. You should feel that these microwave ovens are "on and off". In view of the different connection positions of furnace lamps in electric furnaces, the turn-on time and turn-off time of lamps in various microwave ovens may be different when microwave ovens are working: some lamps are turned on when working, and turned off after opening the door; However, others do the opposite. Users don't know how the lights are connected, but through the operation in the selection, as long as the lights of the stove are regular rather than random, they should be considered normal. When the microwave oven is working, the glass turntable in the cavity should not stop and go, and the sound should not be too loud, not to mention squeaking. At present, in order to prolong the life of the magnetron and increase the speed of the fan motor, the fan noise is slightly increased, but it is controlled within a reasonable level. Through this measure, the life of the magnetron, the heart of the microwave oven, has been greatly improved. After the microwave oven is started every time, the rotating direction of the dish is random. This is determined by the characteristics of turntable motor, which is a normal phenomenon. (2) Computer-controlled microwave oven: Turn on the power, press the control button, and the display screen should have a clear, rapid and definite response. The operating procedure of computer-controlled microwave oven is quite complicated. With the help of sales staff, several commonly used programs can be tested to verify whether various working modes of microwave ovens are normal. (3) Microwave oven with BBQ function: Turn the control button to BBQ to start the microwave oven. After about 5- 10 minutes, you should see the red light emitted by the electric heating element above the cavity. Some microwave and barbecue functions in a microwave oven with barbecue function can work at the same time, while others can work alternately. According to the instructions in the manual, it is also necessary to check these functions with the help of inspectors. Other aspects of inspection are the same as those of mechanical microwave ovens and computer-controlled microwave ovens. My family bought Haier's, which I think is quite good.