The preparation quality of a microwave indicates how well the microwave will heat your dish. We evaluate the preparation quality based on various specifications. A microwave with a mid-range preparation quality has about half of these specifications. They often don't have an inverter motor, but they do have more than 1 entrance to spread micro waves. This way, the microwave will heat more evenly than a basic one. A mid-range microwave had enough power settings, so you can heat or thaw your dishes at the right power.