Wash all jars and lids and dry thoroughly.

Bring the milk to a boil over medium high heat, stirring constantly to prevent the bottom from burning, and using a heavy, high-sided pot. Once the milk begins to climb up the sides of the pan, remove from heat and stir it down. Place back on the burner and continue to cook for about a minute more. Remove the pan from the burner, and let cool to around 110 degrees F. Use of a thermometer will be helpful; the milk will be lukewarm.

Place the weighed plain yogurt into a mixing bowl. Add a couple of ladelfuls of the warm milk into the yogurt, and mix until smooth. Pour this back into the pot of milk. Divide the milk mixture evenly between the jars.

Set the jars onto the base of the machine. Turn it on, and enter in the time required for the milk being used. 2% milk will take about 9 hours to create the yogurt. Cover the jars with the lid. Make sure to set the machine in an area that will be undisturbed and not bumped or moved as this will directly have an effect on the final texture of the finished product.

The time is up, carefully remove the lid to avoid any water that has condensed on the lid to excessively get into the yogurt. Mark the date on the lids, and place on the jars. Place in the refrigerator for at least three hours to finish up the process.

Serve the chilled plain yogurt as desired.