Frequency of use
Usually it is divided into three control automatic type (timing, temperature adjustment, power adjustment), temperature control timing type and simple type.
Temperature control timing type is enough, because this type of function is complete, high cost performance; three control automatic type, all kinds of baking function is full, but the price is more expensive; ordinary simple type is "entry level" product, this type of product is cheaper, but because the temperature and time are manual control, it needs the user to be careful. Grasp the baking temperature, avoid food "overcooked" or excessive baking, affecting the delicious. 
The capacity of the oven is generally from 9 liters to 60 liters, so when choosing the capacity specification, the use of the electric oven must be fully considered. Electric oven is not lower power, the better, high power electric oven heating rate is fast, heat loss is less, but it will save electricity. Household electric oven should generally choose more than 1000 watts.
Internal and external quality
Good ovens should be well sealed so that heat loss can be reduced. The way of opening the oven is mostly from top to bottom, so we should carefully test the lubrication of the door. The door should not be too tight, otherwise it will burn easily when you open it. The more barbecue and barbecue stands in the oven, the better.
Electric oven is an electrical appliance with sudden temperature changes, so the oven material is thick and safe. The products with high quality of oven materials need two layers of glass, and high standard 0.5mm thick cold-rolled or stainless steel panel materials. Medium and high grade products should have at least 3 roasting positions, which can be close to upper, near and below. In addition, the cleanliness inside the oven is also the focus of investigation.
Generally, the oven can not automatically adjust the temperature. The temperature regulator of the oven is an automatic switch. It stops working at its setting temperature and continues to be heated again below the temperature. If you want to control the temperature, you can only switch it off in a few minutes.