This stirring hot plate is perfect for stirring your yeast starters when the ambient temperature is low or you want to grow up a culture at warmer than ambient temperatures. Simply add the stir bar to the flask, add your wort, boil, cool and pitch your yeast. Add the flask to the magnetic stirrer, set the temperature and keep your starter warmed and aerated for proper yeast growth. Use the included temperature probe (sanitized of course!) to monitor the temp of your culture. This mixer comes with a removable probe holding arm and a temperature probe.