background image

CAUSE

REMEDY

This is not an error so it may be ignored and the temperature taken.

Cool the sensing section and then take the temperature.

INDICATOR

Displayed when the temperature of the sensing section is less than
89.6°F (32°C).

Displayed when the temperature of the sensing section is greater
than 107.6°F (42°C).

This is not an error, so the temperature may be taken as is.

Displayed when the surrounding temperature exceeds 
89.6°F (32°C).

Temperature
Displayed

ERROR DISPLAYS

TAKING THE TEMPERATURE

1.

Press the 

button.

A default temperature 98.6°F (37.0°C) is shown
on display.

NOTE:

When a temperature other than 98.6°F (37.0°C)
is displayed, please refer to the
“TROUBLESHOOTING” section for details to correct the
problem.

2.

Apply the thermometer to the measurement site.

Use the oral, rectal or underarm site for measurement.

NOTE:

Even if the “L” indicator fails to display (when only the
temperature is displayed), this is not an error. So the
temperature may be taken as is.

3.

When the reading is ready, the thermometer will emit a
[beep-beep-beep] sound three times. Remove the
thermometer from the measurement site and read the
result.

BUZZER NOTIFICATION TIMING

NOTES:

• The buzzer notification timing is based on an environmental temperature of 73.4 °F.
• There will be individual differences in the measurement results.

4.

Turn off the thermometer and store it in the storage case.

NOTES:

• The reading will automatically be stored in memory.
• Although the thermometer will automatically switch itself off 30 minutes after use or after 3 minutes when it has not been used; it should be

turned off manually to conserve the battery.

Underarm : approx. 75 seconds

Rectal : approx. 35 seconds

Oral : approx. 60 seconds 

Thank you for purchasing Omron Digital Thermometer.

The thermometer you purchased offers a safe, accurate and quick temperature reading. You can measure your temperature through oral, rectal or
underarm. This thermometer eliminates any worries about broken glass or mercury hazards. Note that your temperature is affected by smoking, eating
or drinking. Thoroughly read this instruction manual before using your OMRON MC-246 Digital Thermometer. We recommend that you practice
taking your temperature with the thermometer when you are healthy. In this way you will gain confidence in your technique when using the
thermometer. Contact your doctor if you have any questions regarding specific temperatures. The thermometer is provided non-sterile.

IMPORTANT SAFETY NOTES

To assure the correct use of the product basic safety, measures should always be followed including the precautions listed below.

WARNING

• A high or prolonged fever requires medical attention, especially for young children. Please contact your doctor.
• Carefully read and follow the enclosed instructions to ensure accurate temperature readings. Note that temperature readings are affected by many

factors including physical exertion, the drinking of hot or cold beverages before measurement, as well as measuring technique.

• Please keep still during measurement.
• The use of temperature readings for self-diagnosis is dangerous. Consult with your doctor for the interpretation of results. Self-diagnosis may lead to

the worsening of existing disease conditions.

• This thermometer is used for taking temperatures through oral, rectal or underarm. Do not attempt to take temperatures at other sites, such as in the

ear, as it may result in false readings and may lead to injury.

• Store the thermometer out of the reach of children. Do not allow children to take their temperatures unattended. Children may injure themselves

when attempting to take temperatures without supervision.

• Do not attempt measurements when the thermometer is wet as inaccurate readings may result. 

CAUTION

• Do not bite on the thermometer. Doing so may lead to breakage and/or injury.
• Do not share the thermometer among individuals.
• Do not attempt to disassemble or repair the thermometer. Doing so may result in inaccurate readings.
• Do not attempt to incinerate the battery. It may burst.
• Pay attention to polarity (+ –) when replacing the battery. Failure to do so may lead to fluid leakage, heat generation or bursting, resulting in damage

to the unit.

• Remove the battery when the thermometer will not be used for 3 months or more. Failure to do so may lead to fluid leakage, heat generation or

bursting, resulting in damage to the unit.

• Do not use mobile phones near the thermometer.
• Do not use the thermometer in places where strong static electricity or electromagnetic fields are present. Doing so may lead to inaccurate readings

and may contribute to instrument failure.

• Do not force the thermometer into the rectum. Stop insertion and abort the measurement when pain is present. Failure to do so may lead to injury.
• Do not attempt rectal measurements on persons with rectal disorders. Doing so may aggravate or worsen the disorder.
• Do not step on the unit or the storage case.
• Do not attempt to disinfect the sensing section of the thermometer by immersing in alcohol or in hot water (water over 122°F).

GENERAL SAFETY PRECAUTIONS

• Do not use the thermometer to measure anything other than human body temperatures.
• Do not drop the thermometer and storage case or expose them to shock or vibration.
• Do not store the thermometer in the storage case when it is damp. Wipe it off with a dry cloth first.
• Avoid taking the temperature until after 30 minutes has lapsed after exercise, bathing or eating/drinking.

Button

Display Window

DIGITAL THERMOMETER
Model MC-246

Accessory: Storage Case

INCORRECT MEASUREMENTS

Taking the temperature immediately after exercising,
bathing, eating or drinking will result in an incorrect
measurement.
Correct:

Wait at least 30 minutes before taking the
temperature.

Taking the temperature after moving around.
Correct:

Take the temperature immediately after waking up
or wait for at least 30 minutes after moving around.

* Moving around after awakening increases the body

temperature.

- Only applies when taking underarm

temperatures -

The following may result in incorrect measurements.

Heavy underarm perspiration

Taking the temperature after being under the blankets
for a long time.
Correct:

Wipe off any underarm perspiration before
taking the temperature.

Turn the display so
that it faces
inwards.

CORRECT MEASUREMENT

Measurement accuracy cannot be assured when the method used to measure the temperature is incorrect.

ORAL USE (for ages 4 and older):

The mouth should remain closed up to 5 minutes before attempting a reading.

• Place the thermometer in the mouth under the tongue so that it rests to the left or right of the root of the

tongue.

• Use downward tongue pressure to hold the thermometer in place. 
• Hold the thermometer to keep it from sliding around in the mouth.

The display section
is faced upwards.

Placement Points

Root of
Tongue

UNDERARM (AXILLARY) USE:

• Place the probe tip in the center of the armpit.

• Lock the probe tip under the arm, using the arm to slightly apply

pressure inwards.

* In the case of infants and very young children, gently hold the

arm to prevent movement.

The angle should be
35-45 degrees in
relation to the arm.

Thermometer Angle

3.

Insert the new battery with the “+” pole
facing up as shown in the diagram.

BATTERY REPLACEMENT

Battery: 

Alkaline-Manganese Button Battery LR41 (available commercially) 

Battery Replacement Indicator (

)

Replace the battery when the battery replacement indicator appears when the thermometer is switched on.

Coin

Battery Cover

The “+” mark
faces upwards

1.

Use a coin to take off the battery cover.

4.

Use a coin to replace the battery cover.

NOTES:

• The thermometer comes fitted with a battery for testing purposes.

This battery may not provide the same amount of battery life as a
new battery.

• Consult your local authorities and follow their instructions for the

disposal of batteries and/or the thermometer.

• Do not loose the O-ring around the battery

cover. Water-resistant will fail and can lead
to misreading and failure of the unit.

2.

Remove the battery.

Battery

DISPLAYING THE LAST TEMPERATURE

Press the 

button to display the temperature that was measured most recently. 

For details, please refer to the “TAKING THE TEMPERATURE” section.

CARE AND MAINTENANCE 

Keep the thermometer clean.

• Do not use strong jets of water to clean the thermometer or leave it immersed in water for

long periods of time.

• Wipe the thermometer with a soft clean cloth.
• When using alcohol to clean the thermometer, make sure that it does not come into contact

with the indicator section.

• For stubborn stains, wipe the thermometer with a cloth that has been dampened with water or

a neutral detergent solution and then wring thoroughly. Finish by wiping with a soft dry cloth.

• Observe the following to prevent damage to the thermometer.

- Do not use benzene, thinner, gasoline or other strong solvents to clean the thermometer.
- Do not soak the sensing section in alcohol for long periods of time or attempt to sterilize it

using hot water (water at a temperature of 122°F (50°C) or higher).

- Do not use ultrasonic washing to clean the thermometer.

Cleaning and disinfection

• Omron recommends to wipe the device with damp cloth. For disinfection, 70% Ethanol or

Isopropyl alcohol can be used. Do not attempt to disinfect the sensing section of the
thermometer by immersing in alcohol or in hot water (water over 122°F).

Store the thermometer in its storage case.

• Do not store the thermometer in the following types of

places. Doing so may damage the thermometer.

- Wet locations.
- Locations with high heat and humidity or those that are

exposed to direct sunlight. Areas close to heating
equipment, dusty locations, or environments where
there are high salt concentrations in the air.

- Locations where the unit will be subjected to leaning,

shock or vibration.

- Pharmaceutical storage areas or locations where

corrosive gases are present.

5328583-4A

CAUSE

TROUBLESHOOTING

CORRECTION

Check to see that the thermometer is being placed at
the location as described in the “CORRECT
MEASUREMENT” section.

PROBLEM

• The temperature sensing part of the thermometer is

being placed at a different location for each reading.

• The thermometer is moved while the temperature is

being taken.

• The mouth is kept open while the measurement is in

progress.

Wide differences in readings

Take out the battery and replace using the correct
polarity.

The polarity 

is reversed.

Nothing appears in the display
section when the power switch is
pressed.

Check to see if 

appears in the display section.

Replace with a new battery (LR41).

The battery is depleted.

The thermometer may be used as it is.

A temperature from [98.4°F (36.9°C)] to [98.8°F (37.1°C)]
is displayed.

[98.6°F (37.0°C)] is not displayed
during the measurement
preparation period.

Please contact your nearest authorized OMRON
dealer.

A temperature other than that in the range from 
[98.4°F (36.9°C)] to [98.8°F (37.1°C)] is displayed, even
after turning the thermometer on and off several times.

SWITCHING BETWEEN FAHRENHEIT/CENTIGRADE (CELSIUS)

Press the 

button for 7 seconds until a beep is emitted.

The display will change to the other measurement scale at the
time when the beep sounds.

All of the display symbols
appear. 

After 5 seconds

After 2 seconds

°F to °C °C to °F

Beep

Beep

°

F

°

C

FAHRENHEIT/CENTIGRADE CONVERSION CHART

96

35.6

36.1

34.4

35.0

37.2

38.3

39.4

40.6

36.7

37.8

38.9

40.0

97

94

95

99

101

103

105

98

100

102

104

The thermometer will
automatically switch itself off.

Beep

All of the display symbols
appear. 

The most recently measured
temperature is displayed
together with the M indicator.

Waiting for use.

When the [°F (°C)] indicator
symbol blinks, the 
thermometer is ready for use.

Temperature measurement
will commence and the 
[°F (°C)] indicator symbol
will blink.

Blinking

The [°F (°C)] indicator symbol
will stop blinking and stay on
when the reading is ready.

°C

°C

°C

Beep-beep-beep

Indicator stays lit

SPECIFICATIONS

Product Name: 

DIGITAL THERMOMETER MC-246 (MC-246-Z)

Power Consumption:

0.1mW

Sensing Unit:

Thermistor

Temperature Display:

4-digit (°F), or 3-digit (°C) display in 0.1 degree 
increments 

Measurement Accuracy:

± 0.2°F (89.6 to 107.6°F)
± 0.1°C (32.0 to 42.0°C) 
(when measured at a standard room temperature of 73.4°F
(23°C) in a test tank held at constant temperature)

Power Supply:

1.5V DC, 1 LR41 Alkaline-Manganese Button Battery 

Battery Life:

Approx. 2 years or more (3 times per day)

Measurement Method:

Actual measurement

Applied Part:

Measurement Range:

89.6 to 107.6°F (32.0 to 42.0°C)

Usage Environment 

Surrounding tempe50 to +104°F (+10 to +40°C), Relative Humidity 30-85%RH

Temp and Humidity:
Storage Environment

Surrounding temperature –4 to +140°F (-20 to +60°C), Relative Humidity 10-95%RH

Temp and Humidity:
Weight:

Approx. 0.42 OZ ((12g) with battery installed)

External Dimensions:

0.76"(w) 

×

5.22"(l) 

×

0.39"(d) (19.4 mm (w) x 132.5 mm (l) x 10.0 mm (d))

Accessories:

Test Battery (Alkaline-Manganese Button Battery LR41), Storage Case, Instruction Sheet.

The specifications may be changed without prior notice.

=Type B

RECTAL USE:

• Commonly used for young children when it is difficult to take an oral or underarm temperature.
• Lubricate with a water-soluble gel. Do not use petroleum jelly.
• Gently insert the probe tip no more than 1/2 inch into the rectum. Do not force the tip into the rectum if resistance is encountered.
• Disinfect the thermometer after use. For details, please refer to the “CARE AND MAINTENANCE” section.

Tongue

O-ring

Probe Tip

Manufactured by OMRON HEALTHCARE
Made in China

Distributed by :
OMRON HEALTHCARE, INC.
1200 Lakeside Drive
Bannockburn, Illinois 60015

Toll Free Customer Service:
1-800-634-4350
www.omronhealthcare.com
Copyright © 2009 Omron Healthcare, Inc. 

LIMITED WARRANTIES

Your new digital thermometer, excluding the battery, is guaranteed to be free from manufacturers defects for one year under normal use. This warranty extends only
to the original retail purchaser. We will, at our option, repair or replace without charge any thermometer. To obtain warranty service contact Customer Service by
calling 1-800-634-4350 for the address location and the return shipping and handling fee.

ALL IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR PARTICULAR PURPOSE, ARE LIMITED TO THE DURATION OF THE APPLICABLE WRITTEN WARRANTY ABOVE

. Some states do not

allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

OMRON SHALL NOT BE LIABLE FOR LOSS OF USE OR ANY OTHER INCIDENTAL, CONSEQUENTIAL OR INDIRECT COSTS, EXPENSES
OR DAMAGES

. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusions may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which may vary from state to state.

MC-246_en_sp_r3_q6.qxd  10/15/09  2:59 PM  Page 1

Reviews: