Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's a Thermos

I got one on Freecycle, thinking it would make my yoghurt making easier. Turns out it's nothing more than an electric thermos. I've been making yoghurt as others described below, but using my large Thermos and making a half gallon at a time. The only thing I do differently is wash it out with boiling water beforehand to clean it and heat it up. Saves the electricity for the exact same outcome. No need to buy another appliance to make yoghurt.