Soldering Iron Tester Power Source Battery Testing Functions Tip Temperature Display Units of Measure Celsius Fahrenheit Tip to Ground Resistance Accuracy +/-3 Degrees C +/-6 Degrees F Tip to Ground Resistance Resolution 0-40 Degrees C (32-104 Degrees F) Thermocouple Type Type K (CA) Product Type Tip Thermometer Operating Voltage 9V Features Thermometer Design for Right or Left Handed Operators Thermometer Auto Shut-Off After Three Minutes Overall Depth 1.73 in