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3291271-5B

Table of Contents

1. Introduction

2.  Important Safety Information

3.  How the Predictive Temperature Measurement Works

4.  Measuring Temperature Correctly

5.  Pairing Your Thermometer with a Smart Device

6.  Using Your Thermometer

7. Disabling 

Bluetooth®

8.  Replacing the Battery

9.  Restoring Your Thermometer to the Default Settings

10. Maintenance

11.  Error Messages and Troubleshooting

12. Specifications

13.  FCC Statement

14.  Limited Warranty

15.  Guidance and Manufacturer’s Declaration

1.  Introduction

Thank you for purchasing the OMRON ET6250 Wireless Digital Thermometer. This wireless digital thermometer eliminates 

any worries about broken glass or mercury hazards.

Safety Instructions

This instruction manual provides you with important information about the OMRON ET6250 Wireless Digital Thermometer. 

To ensure the safe and proper use of this device, READ and UNDERSTAND all of these instructions. 

If you do not understand these instructions or have any questions, contact 1-800-634-4350 before attempting to 

use this device. For specific information about your temperatures, consult with your physician.

Intended Use

The wireless digital thermometer is used for the intermittent measurement and monitoring of human body temperature 

orally. The device is for adult and pediatric populations and is intended to be operated by adults. It is mainly designed for 

household use.

Receiving and Inspection

Remove this device from the packaging and inspect for damage. If this device is damaged, DO NOT USE and contact 

1-800-634-4350.

Symbols Glossary

For symbol information, visit: OmronHealthcare.com/symbols-glossary

2.  Important Safety Information

Read the Important Safety Information in this instruction manual before using this device. Follow this instruction manual 

thoroughly for your safety. Keep for future reference.

 Warning

Indicates a potentially hazardous situation which, if  not avoided, could result in death or serious injury.

• Keep the thermometer out of the reach of infants, toddlers and children.

• Always supervise children during temperature measurement.

• To help avoid choking, keep the battery, battery cover and screw away from infants, toddlers and children. If any of these 

are swallowed, consult with your physician immediately.

• NEVER diagnose or treat yourself based on your readings. ALWAYS consult with your physician.

• DO NOT use the thermometer to measure anything other than human body temperature.

• This thermometer is designed for oral temperature measurements only. DO NOT attempt to take measurements at other 

sites, such as in the ear, underarm or rectum as it may lead to injury or false readings.

• DO NOT attempt to take measurements when the thermometer is wet. It may cause inaccurate readings.

• DO NOT use the thermometer with other medical electrical (ME) equipment simultaneously. This may result in incorrect 

operation of other medical electrical equipment and thermometers and/or cause an inaccurate reading.

• NEVER throw the thermometer into a fire. Dispose of the thermometer in accordance with your local regulations.

Data Transmission

• This product emits radio frequencies (RF) in the 2.4 GHz band. DO NOT use this product in locations where RF is restricted, 

such as on an aircraft or in hospitals. Turn off the 

Bluetooth®

 feature in this thermometer when in RF restricted areas. For 

further information on potential restrictions refer to documentation on the Bluetooth usage by the FCC.

• This product emits radio frequencies. Turn off the Bluetooth feature in this thermometer when taking a measurement 

with a cardiac pacemaker, implantable cardioverter defibrillators, or other implanted electronic devices. This may result in 

incorrect operation of the implanted electronic devices and the thermometer. 

 Caution

Indicates a potentially hazardous situation which, if  not avoided, may result in minor or moderate injury 

to  the user or patient, or cause damage to the equipment  or other property.

• DO NOT use the thermometer in places where strong static electricity is present. It may cause an inaccurate reading 

and/or cause the thermometer to operate incorrectly.

• DO NOT share this thermometer among other individuals because infectious diseases may occur.

• DO NOT disassemble or attempt to repair the thermometer. It may cause inaccurate reading and/or result in incorrect 

operation of the thermometer.

• DO NOT bite on the thermometer because breakage and injury may occur.

• DO NOT pull or bend the thermometer.

• DO NOT drop or step on the thermometer or storage case.

• DO NOT subject the thermometer or storage case to strong shocks or vibrations.

• DO NOT use or store this thermometer in places with high or low humidity or high or low temperatures. Refer to 

section 12.

• During measurement, make sure that no mobile device or any other electrical devices that emit electromagnetic fields is 

within 12 inches  (30 cm) of this thermometer. This may result in incorrect operation of the thermometer and/or cause an 

inaccurate reading.

3291271-5B_MC-6811T2-Z_IM_M02_210709.pdf

• Ensure that the thermometer has acclimated to room temperature before taking a measurement. Taking a measurement 

after an extreme temperature change could lead to an inaccurate reading. OMRON recommends waiting for 

approximately 2 minutes for the thermometer to warm up or cool down when is used in an environment within the 

temperature specified as operating conditions after it is stored either at the maximum or at the minimum storage 

temperature. For additional information of operating and storage/transport temperature, refer to section 12.

• Avoid smoking, drinking or eating  for at least 30 minutes before taking a measurement.

Data Transmission

• DO NOT replace the battery while your reading is being transferred to your smart device. This may result in incorrect 

operation of the thermometer and failure to transfer your temperature data.

Battery Handling and Usage

• DO NOT insert the battery with its polarity incorrectly aligned because damage to the thermometer and injury may occur.

• ONLY use a CR2032 lithium button battery with this thermometer. DO NOT use any other type of battery.

• Remove the battery when the thermometer will not be used for 3 months or more.

• If battery fluid gets in your eyes, immediately rinse with plenty of clean water. Consult with your physician immediately.

• DO NOT replace the battery while the power is on.

• DO NOT use the battery after its expiration date.

3.  How the Predictive Temperature Measurement Works

About the Equilibrium Temperature

The equilibrium temperature refers to the stable temperature of the inner body which is also known as “core body 

temperature”, such as the brain or internal organs.

With the thermometer in the mouth, it needs approximately 5 minutes to take the equilibrium temperature.

What is Predictive Temperature Measurement?

This thermometer predicts what the equilibrium temperature reading would be at 5 minutes after the start of the 

measurement in approximately 10 seconds, by analyzing and calculating the rising oral temperature.

Predict 

equilibrium 

temperature 

in 5 minutes

Start 

measurement

Temperature

Time

Approx. 

10 sec.

Approx. 

5 min.

Equilibrium 

temperature

Predictive 

temperature 

measurement 

result

Analyze and calculate 

temperature rise

• Accuracy of the predictive temperature measurement could be affected by incorrectly taking a temperature 

measurement, blood circulating conditions, or by body type.

4.  Measuring Temperature Correctly

Measurement will not be accurate when the thermometer is incorrectly used to take a measurement.

• Place the sensor tip in the mouth under the tongue so that it rests to the left or right beneath the tongue.

• Use downward tongue pressure to hold the thermometer in place.

• Using your hand, hold the thermometer to keep it from sliding around in the mouth.

•  Remain still and keep the mouth closed until the entire measurement is complete.

Display is faced 

upwards

Placement 

points

The following may result in incorrect measurements:

Taking a measurement immediately after exercising, bathing, eating or drinking.

• Wait at least 30 minutes before taking a measurement.

Taking a measurement after moving around after awakening.

• After awakening,  it is recommended to take a measurement before starting your morning routine as this can increase 

your body temperature. It is recommended to measure directly after waking up or rest 30 minutes before taking a 

measurement.

Taking a measurement repeatedly.

• Turn the power off and wait at least 30 seconds, and then take a measurement again.

5.  Pairing Your Thermometer with a Smart Device

The date and time will not be shown on your thermometer, but the date and time will automatically be set when you pair 

your thermometer with your smart device.

Note

• To transfer your readings to your smart device, first download and install the compatible OMRON app and follow the 

instructions within the app.

Review the list of compatible smart devices at OmronHealthcare.com.

1. 

Enable Bluetooth on your smart device.

2. 

Scan the code to the right with your smart device camera or visit OmronHealthcare.com/app 
to find the OMRON compatible app for this product.

3. 

Download and install the compatible OMRON app onto your smart device.

If you already have the compatible OMRON app and have created your account, open the app and 

add your new thermometer.

4. 

Open the app and follow the pairing instructions shown on your smart device.

5. 

Confirm that your thermometer is connected successfully.

When your thermometer is connected successfully to your smart device, the “OK” symbol appears 

with a beep sound.

6. 

Press the [Power] button to turn your thermometer off.

Note

• Your thermometer will automatically turn off after 10 seconds.

• If you do not pair this thermometer to set the date and time, any readings you take with this thermometer will not be 

transferred.

• Please be aware that OMRON will not be responsible for the loss of data and/or information in the app.

• Only compatible OMRON apps should be used with this thermometer to help ensure correct data transfer.

6.  Using Your Thermometer

1. 

Press the [Power] button.

1)  Symbols appear on the display as an internal test function, and the 

buzzer beeps.

2)  The most recent reading with “m” is displayed.

3)  When “L” appears, the thermometer is ready for use.

Note

• The display will show “L” (or the actual temperature if it is stored in warm ambient environment 

above 89.6 °F (32.0 °C)).

2. 

Insert the thermometer properly into the mouth.

Refer to section 4 for instructions on proper insertion and sensor placement in the mouth.

3. 

The buzzer will emit a beep-beep-beep sound 3 times when the measurement is complete.

Buzzer timing

Approx. 10 seconds

The buzzer timing may vary depending on the ambient temperature or if the thermometer is not 

properly inserted or held in the mouth during temperature measurement. 

Note

• If the buzzer beeps and the error as shown in the illustration to the right appears, 

refer to the section 11.

4. 

Open the app on your smart device.

The transmission will start automatically.

Note

• Check within the app to make sure your readings are successfully transferred.
• If  “Err” and “ ” appear, follow the instructions in the app.

• If necessary to transfer the reading manually after the measurement, press the   button of the thermometer and 

refer to the app for instructions.

•  For further details regarding transferring your readings to your smart device, refer to the app.

5. 

Press the [Power] button to turn the thermometer off. 

Clean the thermometer before returning it to the storage case. Refer to sub-section 10.2.

Note

• The thermometer will automatically turn off 3 minutes after a measurement has completed.

• Your reading will automatically be stored in the thermometer's internal memory. The thermometer can store up to 

30 readings, but the previous readings cannot be viewed on the thermometer.

7.  Disabling Bluetooth®

Bluetooth is enabled as default.

1. 

When your thermometer is off, press and hold the   button for more than 10 seconds.

“oFF” appears with a beep sound.

2. 

Press the [Power] button to turn your thermometer off.
Note

• When Bluetooth is disabled and power is on, the “

” symbol appears.

• To enable the Bluetooth, make sure the display is turned off, then press and hold the 

 button for more than 2 seconds. “on” appears on the display with a beep sound. The “ ” 

symbol does not appear when the power is on.

• Your thermometer will automatically turn off after 10 seconds.

Beep

Beep

Beep-beep-beep

Beep

Beep

Beep

Wireless Digital Thermometer

ET6250

Instruction Manual

For Single Patient Use Only

[Power] button

Display

Sensor tip

[Connection] button

Probe

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