The Thermapen 1 colour-coded digital thermometer utilises a type K thermocouple sensor that is faster to respond to changes in temperature than most comparable thermometers. This is due to the thermocouple sensor's small physical size; being small in size also allows minimal immersion depth. The other significant benefit of using a thermocouple sensor is the durable and robust nature of the sensor element.Temp range -49.9 to +199.9°C. Resolution 0.1°C. Accuracy ±0.4°C ±1 digit.Battery life 100 hours.