The temperature settings on a freezer chest with a knob ranging from 0 to 7 do not directly correspond to specific temperatures in degrees Celsius or Fahrenheit. Instead, they represent general settings for controlling the cooling intensity of the freezer. However, as a rough guide, you can estimate the temperature range for each setting: 

• Setting 0: Off (no cooling)
• Setting 1: Warmest temperature (least cooling)
• Setting 7: Coldest temperature (maximum cooling)

The actual temperatures achieved at each setting can vary depending on factors such as the ambient temperature, placement of the freezer, air circulation inside the unit, and placement of items inside the unit. For precise temperature control, it's advisable to use a separate thermometer to monitor the internal temperature of the freezer.

The best temperature setting for a freezer chest will vary depending on a number of factors. However, a good starting point is setting 4. If after 24 hours the items in the freezer don't seem cold enough, adjust the temperature up by 1 and recheck after an hour.