Key Description： "Hold/CAL", you can press this key to fix the temperature reading. "On/Off switch" is the switch on the thermometer. "Light and ℃/℉ switch", you can turn on the backlight by short press the button; You can freely switch between °C and °F by long pressing the button for 3 seconds. Large Screen LCD display When you are in a smoke filled, dark or too bright environment, turn on the backlight, which will be very useful. Of course, the screen area is 3.4 × 1.2cm², the font is large enough. Typically, you can see the numbers clearly without turning on the backlight. IP66 Waterproof Whether it's liquid (like infant formula, oil) or solid (steak, pie), just insert the thermometer probe into the food and you can get the temperature within 2 seconds. This thermometer is slim and easy to carry. It can measure all kinds of liquid and solid food. Read more Specifications: Response Time: 2-4seconds Temperature Range: -58°F~572°F (-50°C~300°C) Temperature Accuracy: ±1°F Temperature Units: °C or °F Probe Length: 5.1 inch Power Auto-off Time: 10 mins of no use Low battery reminder Read more