Download and read the LG fridge manual. It should say somewhere what the temperature range should be, and how long it takes to get there when first plugged in, empty. It may take a couple days to cool down. A fridge thermometer is a really good idea. Buy one for the freezer, too. Some fridge thermometers have the acceptable temperature ranges marked right on them.

Proper refrigerator temperature is not dependent on the brand. Needs to be below 40°F for food safety but above 32°F to avoid freezing. Typical recommendation is 37°F. I set mine at 34°F to 35°F, which is sufficiently above freezing and milk lasts longer. Temp sensor in the unit registers of course at the sensor's location. The actual temp may vary somewhat from one area of the compartment to another.

Yes, mine is 37 and 0.