The "Lo" means the ambient temperature below 32ºC/ºF. Please strat teke your temperaturen when see "Lo".
Fast and Accurate Reading: Fast measurement, normally is 30s - 1m. This thermometer is clinically accurate with high precision.
Wide Range of Use:Works for orally,rectally and in armpit. It is suitable for all ages, babies, children, adults and pets to measure temperature. Note: Don't rinse the thermometer in water. This is not a waterproof thermometer.
Indicator: When the measured value is lower than 32 degree, the display shows L; If higher than 42 degree, it shows H. With memory function, auto display the last measured value after power on, help you easily track the fevers progress.
Auto Power Off: The thermometer has an automatic shutdown function. If no action is taken,it will shut down after 10 mins .But in order to extend the battery life, it is recommended to turn off the power timely after measurement.
Customer Service: From the date of receipt, we provide 1-year service for quality-related issues. Technical service is available. Please contact us through Amazon email
Audited Supplier 
){kind=link}