INSTRUCTION MANUALFOR CITIZEN DIGITALFOREHEAD AND EAR
THERMOMETER CTD710

Type BF applied partIP22

insulation sheet.

Classification for water ingress and particulate matter.

Keeping the probe window clean
Probe window

Warning• Please read all of the information inthis instruction manual before
operating the device.

• Intended use:

Remove the probe cap and check the probe tip.
*When using it for the first time, open theOpen thebattery cap and remove the insulation
battery cap tosheet under the battery cap.
remove theRefer to instruction manual before use.

Thank you very much for purchasing
the CITIZEN digital forehead and ear
thermometer.

• Be sure to have this instruction
manual to hand during use.

Measuring body temperature (temperature detection)

Symbol Explanations

Caution

1902LAT he infrared ear/forehead thermometer canmeasure the infrared heat generated by eardrum/
central forehead area and surrounding tissues toreflect patient’s body temperature accurately.

• Intended operator:	At least 11 years old (5 years intensive reading
experience), no maximum.

Safety Precautions

Dirt in the probe window will impact the accuracy oftemperature detection.

Indicates this device is subject to the Waste Electrical andElectronic Equipment Directive in the European Union. To
protect the environment, dispose of useless device atappropriate collection sites according to national or local
regulations.

• Use commercially available cotton buds without
applying any cleaning agent to clean the probe window.
• If this fails to remove the dirt, moisten a cotton bud inalcohol for disinfection before cleaning.

Paper Recycling

Indicates a potentially hazardous situation which it may result indeath or serious injury.
• Consult your physician before using the device. Do not use
measurement results for self-diagnosis and self-treatment. Always
consult your physician.
• Keep the battery out of reach of children as they could choke on it ifthey mistakenly swallow it.
• Should a child swallow the battery, there is a risk of chemical burns,
penetration of the mucous membrane and other complications that
could lead to death. It is therefore important to seek immediate medical
attention to remove the battery.
• If the battery fluid gets in your eyes or on your skin, rinse it off withwater immediately and then receive treatment from your physician.

Factory: KunShan Radiant Innovation Co., Ltd.
No. 20, TaiHong Road, WuSongJiang Development Zone,
YuShan Town, KunShan City, JiangSu, China

The device and its accessories• Instruction manual• EMC technical data

DeviceSCAN button
Probe cap

Probe tip
LCD screen
Probe

Battery cap• Do not use the device if the probe tip or other parts have beendamaged.

• Do not use the device in enriched oxygen environments such as a
hospital’s hyperbaric chamber or oxygen tent. It could ignite the oxygenand cause a fire.

Caution:Indicates a potentially hazardous situation which it may result ininjury or property damage. The property damage refers toconsequential damage to buildings, household, belongings,
livestock, and pets.
• Do not attempt to disassemble, repair or modify the device.
• Do not shake it holding the probe tip. Do not forcibly bend the probe
tip or expose it to strong impact.
• Use the device only to measure human body temperature.
• Do not expose the device to water.
• Be sure to insert the battery so that the + and - poles are oriented
correctly.
• Do not use device near a mobile phone, other devices that emit
electromagnetic fields or in high electromagnetic environment. This
could cause malfunction.

CTD710-LA_IM_1902LA_EN.indd 1

Make sure that the package
contains all the following items.
• Device• Carefully clean and disinfect the probe after use.

• Do not use the device in the vicinity of flammable gases such as thoseused for anesthesia. It could ignite the gases and cause an explosion.

All objects radiate heat. This device consists of a probe with a built-in
infrared sensor that measures body temperature by detecting the heatradiated by the eardrum and surrounding tissue. Figure 4 shows the
tortuous anatomy of a normal ear canal. As shown in Figure 5, hold theear and gently pull it back at an angle or pull it straight back to straighten
out the ear canal. The shape of the ear canal differs from individual, checkbefore measurement. Accurate temperature measurements make itessential to straighten the ear canal so that the probe tip directly faces
the eardrum.
External auditory
canal[Figure showing view from above]
A normal ear canal. It is sinuous.

Pull back at an angle

Ear mode measurements(1) Press the Power ON/MEMORY switch.
Press

Eardrum
Pull backNames of Parts• Do not use the device on persons suffering from otitis externa,
tympanitis and other ear infections as it may aggravate the symptoms.
• Do not use the device by force when inserting the probe as there is arisk of injury.

Temperature basics

Figure 4

Be sure to read the following instructions before using the device.

Warning:

How to measure correctly in the ear measurement mode

MODE switch
Power ON/MEMORY
switch*Remove the transparent plastic seal
covering the LCD screen and the Power
ON/MEMORY switch before use.

LCD screen
Room temperature measurement symbol
Surface temperature
measurement symbol
Forehead measurement symbol
Ear measurement symbol
PM symbol
24-hour clock symbol

Detected temperature value
Battery symbol

Celsius symbol
Memory symbol
Date and time indication
SET symbol

Repeated beeps are heard when you press the Power ON/
MEMORY switch. When the thermometer mode is on, “ ”
Figure 1(ear measurement symbol) appears. (Figure 1)(2) O rient the probe in the direction of
the eardrum, pull the ear back slightly
External
to straighten out the ear canalauditory
canal(external auditory canal) and slowly
and gently insert the probe.
(3) Press the SCAN button. Temperature
Eardrum
detection ends when the buzzer beeps.
(Measurement time: Approx. 1 sec.)(4) Then remove the probe from the ear
canal and check the measurement
result.

Forehead mode measurements(1) Press the Power ON/MEMORY switch first and then press
the MODE switch once to enter the foreheadmeasurement mode.
The “” (forehead measurement symbol) appears. (Figure 2)
Figure 2(2) When the buzzer starts beeping, move the probe tip towithin 1 cm away from the center of the forehead (or eventouching it) and press the SCAN button. (Figure 3)
Temperature detection ends when the buzzer beeps. Check
Figure 3
the measurement result.
When taking the temperature of small children, measure thetemperature from above so that they do not see thermometer themselves.
* Let the device acclimatize to room temperature for 15 minutes before use. In
forehead mode, an accurate temperature measurement may not be
obtained in an environment where the temperature is less than 20°C. It is
recommended to take a measurement by ear measurement mode ormeasure at a place where the temperature is above 20°C.
CAUTION:• The detected temperature is converted to a sublingual temperature.
• It may not be possible to obtain an accurate body temperature within 30
minutes after exercise or taking a bath.
High temperature alert
If the measurement result is 37.5°C or more, the buzzer will first “beep” once andthen sound repeated “beeps.” (In ear/forehead measurement mode only)

Power off

Hold down the Power ON/MEMORY switch (for about 6 sec) until ““
appears on the LCD screen. (When not in room temperature mode)* Even if the Power ON/MEMORY switch is not pressed, the thermometer is
automatically turned off after one minute of inaction. After use, wipe clean
the device, the probe and probe tip using tissue or wet tissue. Use a dry
cloth to dry it and place the probe cap before storing it.

Figure 5[Figure showing view from above]

Pull back to straighten the ear canal

Taking the temperature of children or infants

Hold the headgently.

• Look deep into the ear before slowly inserting the probe.
• Insert the probe into a narrow ear canal so that it faces the eardrum andcompletely closes off the entrance of the canal.

Displaying measurements stored in memory
This device stores the 9 latest body temperature measurements
together with their dates and the measurement modes used (ear or
forehead) to enable later confirmation.
(1) Press the Power ON/MEMORY switch to turn on the device. Afterthe buzzer beeps, press the Power ON/MEMORY switch again andthe most recent measurement and “ ” (Memory symbol) willappear.
Press

Press

(2) Press the Power ON/MEMORY switch again to display themeasurement prior to the most recent measurement.
* The device will automatically return to measurement mode if left
inactive for about 10 seconds.

Deleting measurements in memory* Individual measurements cannot be deleted.
In power off mode, hold down both the SCAN button
and the Power ON/MEMORY switch (for about 3 sec) todelete all measurements in memory.

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Other Functions

Replacing the battery and precaution

Clock function
Date and time can be set. When set, the measurement value and date
and time of measurement are stored.

When the “
possible.

Forehead and ear thermometer” symbol appears, replace the battery as soon as

Setting method:

When the “” symbol appears, measurements are no longer
possible. Replace the battery.

(1) Press the Power ON/MEMORY switch and the buzzer beeps toindicate the power is on.

(1) Open the battery cap.

(2) Hold down the Power ON/MEMORY switch for about
3 seconds and the SET symbol will start to blink on
the LCD screen indicating it has entered the time
setting mode.
(Figure 6)* If it is difficult to open, insert a pointed (non-metallic) object in thehole between the battery cap and the probe to push it open.
Figure 6(3) Press the SCAN button and the 24 symbol will start to blinkindicating you can select between the 12-hour and24-hour clock.
Press the SCAN button to select “PM” (12-hour clock) or“24” (24-hour clock). (Figure 7)* The PM symbol is not displayed between 0 AM and 11
o’clock.

Turn over the device and press the battery cap upwards to open thebattery compartment. (Figure 10)

Figure 7(4) Press the Power ON/MEMORY switch to set “hour → min → year →month → day” in indicated order.
When the respective symbol on the LCD screen starts to blink during
settings, use the SCAN button to select and the Power ON/MEMORY
switch to determine. Then the next symbol will start to blink, repeat
operation in step (4).

(2) Use the pointed (non-metallic) object to remove the battery.
(Figure 11)(3) Hold the new battery (CR2032) at an angle to insert it under the
hook and press it in until it clicks into place.
Make sure that the plus pole of the battery faces upwards. (Figure 12)(4) Close the battery cap.
* Be sure to dispose of used batteries as soon as possible and in alocation out of reach of children.

Hole

Figure 10

Surface temperature measurement mode

Figure 11

Figure 12

This device can be used to measure the surface temperature of liquid
or solid object.
(Example: water, milk, etc.)
Operation description:(1) Before making a measurement, make sure the probe tip is clean
and not damaged.
(2) When the power is on, press the MODE switch twice
to enter the surface temperature measurementmode.
“ ” (the surface temperature measurement symbol)
appears. (Figure 8)

Maintenance and Storage Methods• After use, wipe clean the device, the probe and probe tip using tissue or
wet tissue. Use a dry cloth to dry it to prevent staining and place theprobe cap before storing it. Any dirt in the probe tip that is left as is will
prevent you from obtaining accurate measurements. Damage may
result.

Figure 8(3) P ress the SCAN button and the surface temperature of the object
will appear in about 1 second.
Each time the SCAN button is pressed, a new measurement is made. If
the temperature of the object being measured changes, the value on
the LCD screen also changes. While holding down SCAN button, themeasured value keeps changing.
(4) H old the device 1 or 2 cm from the object whose temperature youwant to measure to obtain an accurate measurement.
*Temperatures measured in surface temperature measurement modeindicate the surface temperature of an object. The surface temperature
measurement mode cannot be used for measuring body temperature.

Room temperature measurement mode
Indicates atmospheric temperature or the temperature of a room.
(changes in real time)
Operation description:(1) Let the device acclimatize to room temperature for 15 minutes
before use.
(2) When the power is on, press the MODE switch threetimes to enter the room temperature measurementmode.
“ ” (the room temperature measurement symbol) andthe room temperature appear on the LCD screen.
(Figure 9)

Figure 9(3) To check room temperature, place the device in the room on atable or desk not exposed to direct sunlight, the down draft froman air conditioner or other location subject to temperaturefluctuations.

CTD710-LA_IM_1902LA_EN.indd 2

Q&A

This differs from armpit temperature! Which temperature is correct?
Since body temperature measured in the ear and the forehead aremeasured in regions that differ from the armpit, the detected temperature
results may sometimes also differ. Instead of making simple comparisons,make regular measurements under controlled conditions to compare withmeasurement results obtained under normal conditions.
The forehead measurement mode uses an algorithm to calculate obtaineddata.
In the following cases, the temperature of the forehead will be impacted
and it may not be possible to calculate a correct body temperature.
- When measurements are made in a location near an air conditioner orother location exposed to air movement- When the forehead is exposed to direct sunlight- When the forehead is wet with sweat- During a 30-minute period after exercise or taking a bath- When the person whose temperature is measured has been in a location
with a different temperature prior to measurement- When the device used to make the measurements was kept in a location
with a different temperature prior to measurement- When a strand of hair, cosmetics or other object between the forehead
and the probe tip interferes with the measurement.
- When the forehead was covered by a cap just prior to measurement
The temperature differs from each new measurement. Why?
If the temperature reading changes each time, the following are likely
causes. Check and measure again.
1) A consistent method for straightening the ear canal is not being used.
There are individual differences, but a normal ear canal is not straight.
Accurate temperature measurements make it essential to straighten theear canal and pointing the probe tip straight at the eardrum. Refer to thesection “How to measure correctly in the ear measurement mode” in the
instruction manual (front cover).
2) A consistent method for inserting the probe in the ear canal is not being
used.
To ensure stable temperature detection, insert the probe in the ear canalgently. When inserting the probe into the ear canal, keep it pointed in
the same direction and at the same depth or the measurement results
may be inaccurate.
3) Repeated measurements are performed in a short time.
When the probe is inserted into the ear canal, the temperature inside theear may start to be affected. To make another measurement, wait at least
1 minute.
Why does a temperature reading from the right ear differ from areading from the left ear?
Although body temperature does not basically change, the internal
anatomy of the right and left ear is not the same. For this reason, themeasurement results will differ slightly between individuals. To measurebody temperature, measurements should use the same ear.
Can measurements be performed without a probe cover?
This device has been designed so that accurate measurements can be
performed without a probe cover. In addition, if a probe cover of anotherdevice is attached, accurate measurements will not be possible and should
not be used.

• Do not submerge the device in disinfectant or other cleaning agent.
[Damage may result]• Thinner, petrol, benzine must not be used as they will damage thedevice.
• Do not clean using an ultrasonic cleaning device. [Damage may result]• This device is not water-proof. Do not immerse it in water or clean it in
tap water.
• Do not bend, drop or expose it to strong impact.
• Do not store the device without removing accumulated dirt or moisture.
[Damage may result]• Store the device and probe cap in a location inaccessible to children.
• Do not store the device in a location that does not meet storage
environment requirements. [Damage may result]* For reference: (ambient temperature: -20 to 50°C, relative humidity:
85% RH or less)• Do not store the device in a location exposed to water, direct sunlight,
high temperature, high humidity or a location that is excessively dusty.
• Do not store it in a location near open fire or locations that are exposed
to vibration or impact (this includes during transportation).
• Do not store it in a location where chemicals are also stored or where
gas is generated.

There is no probe cover. Is it hygienic to use the device without aprobe cover?
The probe can be hygienically used as long as the tip is kept clean. Refer tothe instructions in “Maintenance and Storage Methods.”
This device is very economical because it does not need a probe cover.
When used on yourself, is it necessary to be concerned about theprobe becoming dirty?
When the probe tip becomes dirty, you will not obtain accurate
measurements. Even if you use it only on yourself, you still have to check it
for dirt build-up. And after use you have to remove dirt from the probe andprobe tip and dry it completely after cleaning.
Can you take temperature measurements using an ear affected by an
inflammation?
Do not use the thermometer in an ear affected by otitis externa, tympanitis
or other disease. Using it could spread the infection to other people andaggravate the symptoms of the patient.

When measurements cannot be madeIf you suspect that the device is not functioning properly, first perform the following
inspections. If the device is not operating normally after these inspections, pleasecontact your local distributor.
Symptom
Nothing
happens whenbuttons arepressed.

Check point/State
Check if the battery is correctly installed.
Check if the battery is depleted.
The device is not ready.
Ambient temperature is outside normal
temperature range of 10 to 40°C.

The device is not operating normally.

RemedyRefer to “Replacing the battery
and battery precautions” tocorrectly install the battery.
Install a fresh battery. (CR2032)
Wait about 7 seconds for thesymbols on the LCD screen tostop blinking.
Leave the device for 15 minutes
in an environment that meets its
temperature requirements.
Remove the battery for 1 min,reinstall it and try again.
If the error persists, contact yourlocal distributor.

1 The measured value is higher than 42.2°C in
ear/forehead measurement mode
2 The measured value is higher than 80°C in If the error persists when it isclear that the temperature of thesurface temperature measurement modemeasured surface is within the
1 The measured value is lower than 34.0°C in measurement range, contact
ear/forehead measurement mode
your local distributor.
2 The measured value is lower than -22°C in
surface temperature measurement mode
Measurements do not start after turning on
the device.

Specifications

Model number
Temperature detection
methodRegion whose
temperature is detected
Rating and power supply
Power consumption
Battery life
Temperature indication
Temperature indication
methodMeasurement range
Maximum permissible
error

WeightDimensions
Additional functions
Electric shock protection
IP protection classOperating environment
Storage conditions
Accessories

Remove the battery and thenreinstall it.

CTD710Infrared
Inside the ear, forehead
DC 3 V(: direct current), CR2032 × 1 pc.
18 mW
Approx. 3,000 times
Numeric 3 digits + °C, units of indication 0.1°C
Temperature correction method
Ear and forehead measurement mode: 34.0 to 42.2°C
Surface temperature measurement mode: -22 to 80°C
Room temperature measurement mode: 10 to 40°C
Ear and forehead measurement mode:  ±0.2°C within 35.0 to 42.0°C±0.3°C for other than above measurement range
Surface temperature measurement mode:  ±0.3°C within 22 to 42.2°C±4% or ±2°C whichever is larger(other than above measurement range)
Room temperature measurement mode: ±1°C
* When blackbody furnace is used at a room temperature of 23°C
Approx. 63 g (including battery)Approx. 45 (W) x 106 (H) x 61.2 (D) mm
Memory for 9 measurements, power auto off
Internal power supply(: BF type applied part)
IP22
Ambient temperature: Ear: 10 to 40°C / forehead: 15 to 40°C
Relative humidity: 85% RH or lessAmbient temperature: –20 to 50°C
Relative humidity: 85% RH or lessMonitor battery (internal), instruction manual, EMC technical data,
Probe cap

* This device and old batteries removed from it must be disposed of in accordance with the rules
and regulations of your local community.
* CITIZEN SYSTEMS JAPAN Co., Ltd. accepts no liability whatsoever for damages resulting from usage
not specified in the instruction manual and repairs, modifications, adjustments, etc. not performedby the manufacturer.
* This device complies with EMC standard IEC 60601-1-2: 2014.
* This device is subject to change without notice due to improvements.

Can babies with narrow ear canals be measured?
The probe need not be fully inserted to enable a measurement. Straighten
the ear canal, align the center of the probe with the center of the ear canaland point it towards the eardrum. There is no need to force the probe into
the ear canal.
Can you use a forehead and ear thermometer to take measurements
under the armpit or under the tongue?
A forehead and ear thermometer cannot be used to measure thetemperature under the armpit or tongue. This device consists of a probewith a built-in infrared sensor that measures body temperature by
detecting the heat radiated inside the ear (eardrum and the external
auditory canal) and by the forehead.

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