How to distinguish the refrigerator gear 1-7?

Let me tell you something, 1-2 is the freezer temperature-minus 16- 18 degrees, gear 3-4 is minus 18-20 degrees, gear 5-6 is minus 20-24 degrees, gear 7 is minus 28 degrees, and gear 7 is used in winter. For example, the freezer is now in the 1 file. It's very cold now. You can open the door and make it stop. The temperature detected by the probe of the thermostat is that 1-2 gear opens at 8- 10 degrees, 2-3-4 gear opens at 6-8 degrees, and 5-6-7 gear opens at 4-6 degrees.