The perfect accessory for homemade jams marmalades and confectionary. Can also be used for Toffee and Caramel. Easy read temperature dial with Fahrenheit and Degrees Celsius readings. Clips comfortably to the side of jam and confectionary pans. Keeping away from hot liquids. Measures Temperatures from 40 Degrees to 200 Degrees Celsius (100 to 400 Fahrenheit). Safe use. Mercury Free