With full readings in only 2 to 3 seconds, the Super-Fast® Thermapen is the world’s best in speed and accuracy. Advanced technology makes the new Thermapen Mk4 even more intuitive than previous models. Hold it in any direction and the display automatically rotates right-side-up so it can be read it in any position—in either hand, straight up or down, without having to move your head. Up to 3,000 hours battery life with a common AAA battery.