Stainless steel and plastic construction (no glass or mercury) makes it the safest lab thermometer ever designed. Measure temperature in soil, cuvets, test tubes, food products, incubators, petroleum hydrocarbons, and virtually all lab tests. Probe guard snaps to handle to extend overall length to 10-3/4 inches. This Food Temperature is essential! Whether you're cooking steaks, burgers, sugar, bread, babies milk, chocolate, home brewing, creating your own candles it's so important to have an accurate temperature reading This foldaway probe is so accurate, easy to read and easy to store. Auto on/off to save your battery time.