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Description

Solutions

LCD Display “Lo” or “Hi”

•  Breezes, water, sweating or cosmetics on forehead may affect measurement.
•  If the testing environment changes drastically or if the thermometer is used directly 

from high temp objects to very low temp objects, the measurement difference may 
be inaccurate. The thermometer should be kept in a relatively stable environment for 
10 minutes in order for heat to balance before starting a new measurement.

•  Ensure measurement distance is 2–3 in. (5–8 cm). 

No response when pressing measurement button

Take out and reinstall batteries.

No display or improper display

Take out and reinstall batteries again.

Shut off right after switching on

Check battery level or take batteries out and reinstall.

PRODUCT NUMBER: THDG986

Non-Contact Infrared Human 

Forehead Thermometer Instructions

TROUBLESHOOTING

1. Open the battery lid and take out exhausted batteries. 
2. Put in 2 AAA alkaline batteries and close up battery lid. After new batteries are installed, the color of the 

backlight on the LCD screen turns green, then orange, then red, with each color flashing one time with a 
beep heard. If no beep is heard, check if the positive and negative pole is correct. See Figure 5.1.

NOTICE:

•  Take out batteries if the thermometer will not be used for a long time. Do not put the battery to fire.
•  Dispose battery according to local regulations.

•  Make sure the sensor and probe cavity are clean, otherwise it will affect accuracy.

CLEANING METHOD:

1. Use a cotton stick or soft cloth with water or alcohol to wipe the casing.
2. Use a cotton stick or soft cloth with alcohol to wipe the sensor surface or probe cavity gently. Don’t use thermometer before 

alcohol is vaporized.

•  Read this instruction sheet thoroughly before use. Make sure battery is well installed. It i not advised to put the thermometer in any liquid or 

expose thermometer to strong sunlight or extremely low temperatures.

•  Forceful impact or dropping the thermometer can cause damage.
•  Do not dismantle the thermometer by yourself.
•  Keep the thermometer out of children’s reach
•  Do not use the thermometer under any circumstance of strong electromagnetic interference.
•  Measurement results will fluctuate due to improper use
•  Using the measurement tools accurately will improve skill use of thermometer.
•  The measurement results cannot supersede a doctor’s diagnosis.
•  Special maintenance is unnecessary for this thermometer. Please contact distributor or manufacturer in case of malfunction.

BATTERY REPLACEMENT

MAINTENANCE & TIPS

Figure 5.1

 

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