Thermapen Mk4 2-3 second readings! High accuracy to ±0.7°F (±0.4°C) Includes NIST-Traceable calibration certificate with test data Foldaway thermocouple probe Patented auto-rotating display Use in either hand Motion-sensing sleep & wake mode Intelligent backlight Waterproof to IP67 3,000 hour battery life (AAA Battery) Display temps in °C or °F 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.