30 second (Results will vary by individual and method of measurement). Reliable measurements with feverline. Easy one-button operation. Last reading memory call. Features: Fast Results: 30-second readout (Results will vary by individual and method of measurement). Clinical: Rigid tip. Multiple Uses: Oral, rectal or underarm use. Peak Temperature: Tone. Feverline: Indicator. Memory Recall: Last reading. Switchable: Degrees F / degrees C. Automatic: Shut-off. Low-Battery: Indicator. Battery Included: One LR41 battery. BPA free.