This is the original Super-Fast Thermapen in the color red. Originally designed for professional users, the Super-Fast Thermapen is chosen by restaurant chains, health inspectors, quality managers and chefs all over the world. The clever pocket design replaces more costly and bulky handheld thermometers while using the same professional thermocouple technology. The Super-Fast Thermapen displays actual internal food or liquid temperatures in only 3 or 4 seconds. Other thermometers make you wait another 20 seconds or more to catch up to the Thermapen. That's a huge difference in a fast paced commercial kitchen or when you're over a hot grill. If you're cooking an expensive cut of meat you want a perfect outcome. You don't want a slow temperature reading that might be misinterpreted and your meat overcooked. A must-have for the serious cook, restaurants or professional chef. So easy to use! The instrument is switched on by unfolding the probe whereby the display illuminates. Folding the probe back will turn off the unit. The Thermapen will shut itself off automatically after a few minutes if left on. When using, the very tip should be immersed or penetrated to at least 1/8 inch. The plastic housing it not waterproof, so care should be taken when cleaning. It comes with a battery so you can use immediately. Ask about the protective vinyl wallet case or the leather case, sold separately.