Digital Thermometer

VICKS ComfortFlex
Digital Thermometer

Model : V965F/V966F

Thank you for purchasing the VICKS® ComfortFlex™ Digital Thermometer with SpeedRead technology, large screen display, and Fever InSight™ feature, a professionally accurate instrument for comfortably measuring body temperature. Please read these instructions carefully to ensure accurate temperatures and safe operation. When used properly, this high quality product will give you years of accurate, dependable service.


  • High, prolonged fever requires medical attention especially for young children. Please contact your physician.
  • Do not allow children to take their temperatures unattended.
  • Do not allow children to walk or run during temperature taking.

If you have any questions or comments about the VICKS® ComfortFlex™ Digital Thermometer, call our toll-free Consumer
Service Line: 1-800-477-0457.


Temperature readings vary from person to person. Although there is no one “normal” temperature reading, a temperature, taken orally, ranging between 97°F and 100°F is considered normal. A rectal temperature is generally 1° higher and an underarm (axillary) temperature will be 1° lower.

The best method to determine your own normal temperature is to use the thermometer when you are feeling well. Record your reading twice a day (early morning and late afternoon). Take the average of the two temperatures. This is considered your normal body temperature. Any variation from it may indicate some sort of illness and you should consult your physician.

Your VICKS® ComfortFlex™ Digital Thermometer is a 3-in-1 thermometer for oral, rectal, or underarm use. Whichever method is used, it is recommended that for 15 minutes prior to use, avoid eating or drinking any liquids, exercising, taking showers or baths, or smoking.

IMPORTANT: Before first use, remove label from the display

Disposable probe covers are provided with your VICKS® ComfortFlex™ Digital Thermometer. Place a cover on the probe tip each time the thermometer is used to help prevent spread of germs. Additional probe covers can be purchased at most drug stores or pharmacy departments.


  2. Turn unit on by pressing the On/Off button (Fig. 1).
  3. Wait for unit to get ready
    – A beep will sound and the display will show a test (Fig. 2).
    – The display will show last measurement for 2 seconds (Fig. 3).
    – After about 5 seconds, the display will show it’s ready (Fig. 4).

Oral Use

Oral Use
  • It is suggested to use a probe cover for Oral Use. Discard the probe cover after taking a temperature.
  • It is important to place the tip of the thermometer well under the tongue to get a good, accurate reading. (Fig. 5) Place sensor tip in areas marked with “3”. Keep mouth closed and sit still to help ensure an accurate measurement.
  • When the peak temperature is reached (usually 12 seconds), 2 beep signals will sound and the “°F” sign will stop flashing. The temperature is now ready to read and will not change when the thermometer is removed.
  • Dispose of used probe cover and wash the thermometer as recommended

Under-the-arm (Axillary) Use
This method is used for babies and young children.

  1. Wipe the underarm with a towel.
  2. Place the probe tip under the arm so the tip is touching the skin and position your arm next to your body (Fig. 6). With a young child, it is sometimes helpful to hug the child to keep their arm next to their body. This ensures that the room air does not affect the reading.
  3. When the peak temperature is reached (usually 11 seconds but sometimes longer for this method), 2 beep signals will sound and the “°F” sign will stop flashing. The temperature is now ready to read and will not change when the thermometer is removed. Note: This method produces a temperature 1° lower than a temperature taken orally.
  4. Wash the thermometer as recommended.

Rectal Use
Commonly used for babies, young children, or when it is difficult to take an oral or underarm temperature.

  1. Cover the thermometer’s tip with a probe cover and lubricate with a water-soluble jelly for easier insertion. Do not use petroleum jelly. Read the label of the lubricant to be sure you are using the right kind.
  2. Lay the patient on his/her side. If the patient is an infant, the proper position for a baby is to lay on its stomach with legs hanging down, either across your knees or at the edge of a bed or changing table. This positions the infant’s rectum for safe and easy insertion of the thermometer.
  3. Gently insert the tip of the thermometer NO MORE THAN 1/2 inch into the rectum. If you detect resistance, stop. Hold the thermometer in place
    during measurement.
  4. When the peak temperature is reached (usually 10 seconds) 2 beep signals will sound and the “°F” sign will stop flashing. The temperature is now ready to read and will not change when the thermometer is removed.
    NOTE: This method produces a temperature 1° higher than a temperature taken orally.
  5. Dispose of used probe cover and wash the thermometer as recommended.

The Vicks® ComfortFlex Digital Thermometer comes with the patented “Fever InSight” feature offers a color indicator with the temperature readout to better understand the temperature measurement.

  • For readings between 97.0-98.9°F, the LCD will display green as the backlight color indicating the measurement is within an acceptable range.
  • For readings between 99.0-100.9°F, the LCD will display yellow as the backlight color indicating a slight elevation in temperature measurement.
  • For readings 101.0°F and above, the LCD will display red as the backlight color indicating possible fever.

The Fever InSight feature continues for about 7 seconds.

Turn the thermometer off by pressing the On/Off button. If you forget to turn it off, the thermometer will automatically turn off after approximately 3.5 minutes.


  • Clean the thermometer by washing with soap and warm water or rubbing alcohol (70% isopropyl alcohol).
  • Wipe dry with soft cloth.
  • DO NOT BOIL OR CLEAN IN DISHWASHER. This will cause the thermometer to no longer function and will void the warranty.
  • Do not wash the unit with any thinner or chemical solvent.


Battery Life: more than 200 hours of continuous operation. (approx. 2 years if used 10 minutes per day, every day).
Accuracy in waterbath: +/-0.2°F between 96.0-107.0°F at room temperature of 71°F.
Temperature Range: 89.6-109.2°F. If less than 89.6°F an “Lo” is displayed. If more than 109.2°F and “Hi” is displayed.
Beeper: Unit will beep for approximately 8 seconds when peak temperature is reached.
Fever alert: A series of 5 short beeps indicate temperatures +101.0°F.
Error messages: The display will read “Err” when a malfunction occurs and the unit will power off after 1 minute.

The VICKS® ComfortFlex™ Digital Thermometer features a long life, mercury free battery. When the “\/” appears and flashes in the center top of the display, the battery is exhausted and needs replacing.

  1. Using a coin, unlock the battery cover and carefully remove the battery with a non-metallic instrument.
  2. Replace the battery with a 1.55V, L41 alkaline or CR1225 silver oxide type or equivalent. Insert the new battery with the positive (+) side facing the battery cover.
  3. Carefully replace the battery cover and, using a coin, tighten the cover.
  4. Properly discard the old battery. Keep out of reach of young children, elderly and pets.

Your VICKS® ComfortFlex™ Digital Thermometer is durable and manufactured for a lifetime of normal, household use. Following directions carefully will ensure years of dependable operation. If for any reason (other than misuse or normal battery replacement) you are dissatisfied with your VICKS® ComfortFlex™ Digital Thermometer, we will repair or replace it, at our option, free during your lifetime.

If the thermometer does not function properly, first check the battery. Replace if necessary. If repair is necessary call our Consumer Relations Department
at 1-800-477-0457 or write to Kaz, Inc., Consumer Relations Department, 250 Turnpike Rd., Southborough, MA 01772, explaining just how the thermometer is improperly working. Our consumer service representative will provide further instruction on how to correct the trouble yourself or will ask you to return the thermometer for repair or replacement.

Questions about your Manual ? Post in the comments!

Join the Conversation


  1. My thermometer beeps after being in my mouth 3 secs and then only continues to beep for 2 to 3 seconds, not the eight stated. Is it broken?

  2. I can’t find a replacement battery. I find CR1225, but it’s a 3V and I can’t find L41 only LR41 with 1.55V. Which battery will work best?

Leave a comment

Your email address will not be published.