TBF-531BODYFAT
MONITOR/SCALE
Instruction Manual
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Tanita TBF-531 Body Fat Monitor/Scale
Principles of body fat percentage measurement
The Tanita Body Fat Monitor/Scale TBF-531 allows you to estimate your body fat
percentage at home as easily as you measure your weight.
What is body fat percentage?
Body fat percentage is the percentage of fat in your body. Until now, your absolute
weight has determined whether or not you were considered overweight or obese. In
recent years, the definition of obesity has been refined to mean the presence of excess
body fat. Too much body fat has been linked to conditions such as high blood pressure,
heart disease, diabetes, cancer, and other disabling conditions.
1, 2
Body Fat Ranges for Standard Adults
Underfat
Healthy
Overfat
Obese
Female 20–39
Age 40–59
60–79
0%
10%
20%
30%
40%
Male 20–39
Age 40–59
60–79
Underfat
1 Based on NIH/WHO BMI Guidelines.
2 As reported by Gallagher, et al., at NY Obesity Research Center.
To determine the percentage of body fat that is appropriate for your body, consult your physician.
Healthy
Overfat
Obese
The BIA method
The TBF-531 uses the BIA (Bioelectrical Impedance Analysis) technique. In this method,
a safe low-level electrical signal is passed through the body. It is difficult for the signal to
flow through fat in the human body, but easy to flow through moisture in the muscle
and other body tissues. The difficulty with which a signal flows through a substance is
called impedance. So the amount of fat in the body can be accurately estimated by meas-
uring the impedance. The signal used is very low, making it safe and imperceptible.
The illustration on the left show how the signal travels through the body.
Tanita’s patented “foot-pad” design sends a safe,
low-level electrical signal through the body to deter-
mine its composition.
Body fat percentage fluctuations in a day
Hydration levels in the body may affect body fat readings. Readings are usually highest
in the early waking hours, since the body tends to be dehydrated after a long night’s
sleep. For the most accurate reading, a person should take a body fat percentage reading
at a consistent time of day under consistent conditions.
Body Fat %
Besides this basic cycle of fluctuations in the daily body fat readings, variations may be
caused by hydration changes in the body due to eating, drinking, menstruation, illness,
exercising, and bathing. Daily body fat readings are unique to each person, and depend
upon one’s lifestyle, job and activities.
22
21
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The graph on the left shows an example of daily body fat percentage fluctuations.
19
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Advantages of the Tanita TBF-531
Previously, body fat percentage was determined by measuring the thickness of subcuta-
neous fat by pinching it with calipers, or by laying a person on a scanning bed and pass-
ing a current from hand to foot. However, these methods had problems; measurement
values varied, professional skills were required, and extensive time was required for
measurement. Currently, the standard methods of fat percentage measurement are
DEXA (dual energy x-ray absorptiometry) and Hydrodensitometry (underwater weigh-
ing).
6am
10am
2pm
6pm
10pm Time
Daily fluctuations in body fat percentage based
on the BIA method
Based on data from both the DEXA and underwater weighing methods, Tanita established
a formula for estimating the percentage of body fat. There is a high correlation between
measurements taken with the TBF-531 and those obtained through DEXA and underwa-
ter weighing.
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Table of contents
1
Safety precautions
Important notes for users
2
Principles of body fat percentage measurement
What is body fat percentage?
Reasonable ranges of body fat percentage
Body fat percentage measurement
Body fat percentage fluctuations in a day
Advantages of the TANITA Body Fat Monitor/Scale TBF-531
4
6
7
Features and functions of the TBF-531
Components
Measuring platform
Accessories
Useful features of the TBF-531
Preparations before use
Inserting the batteries
Positioning the unit
Attaching the support feet
Handling tips
How to measure body fat percentage
Overview of measuring
Setting and storing data in memory
Taking measurements
Taking weight measurement only
Changing values in memory
Replacing the batteries
10
11
Troubleshooting
Specifications
Warranty
FEDERAL COMMUNICATIONS COMMISSION NOTICE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio or television technician for help.
Modifications
The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by Tanita Corporation may void the user’s
authority to operate the equipment.
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Tanita TBF-531 Body Fat Monitor/Scale
Features and functions of the TBF-531
Components
Measuring platform
(1)
Support feet
(4)
(4)
(1)
(1)
(1)
AA-size batteries
Instruction manual
Warranty
Educational booklet
Getting started workbook (1)
Measuring platform
1. Display screen
2. Set button
3. Selection buttons (Up/Down)
4. Toe electrodes
5. Heel electrodes
6. Guide marks sticker
For positioning heels when standing on the unit.
7. PERSONAL keys (start switch)
Setting of age (Adult/Child), gender, and height for up to four persons can
be stored in the memory of the PERSONAL keys.
8. Weight measurement key
Use for weight measurement only.
1
2
3
4
6
7
5
8
4
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Accessories
9. Support feet (4 )
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For use on carpeting 0.8 inches thick or less; a hard, uncarpeted surface
is recommended.
10. AA-size batteries (4)
These are trial batteries. Their service life will be short. New batteries will
last for about a year when this unit is used by a family of four once every day.
10
Useful features of the TBF-531
The TBF-531 allows you to measure both weight and body fat percentage simultaneously
as easily and simply as stepping on a scale.
The TBF-531 can be set for Adult/Child, gender and height, increasing the accuracy of
the measurements.
Personal data (Adult/Child, gender, height) can be pre-set in memory for up to four
persons.
The unit also features a weight only mode.
Switching the weight mode
The TBF-531 can record measurements in lb (pounds), kg (kilograms), or st-lb (British
stone pounds). Select the preferred weight mode by using the switch on the back of
the measuring platform (see illustration at left).
lb
st-lb
kg
lb, kg, or st-lb version
Automatic shut-down function
The automatic shut-down function shuts off the power automatically in the
following cases:
• If you interrupt the measurement process.
The power will shut down automatically within 10 to 20 seconds, depending
upon the type of operation.
• If an extraordinary weight is applied to the platform.
• If you make a mistake during measurement or a key operation.
• After you have completed the measurement process.
NOTE: If the power shuts off automatically due to a problem, repeat the steps from the
beginning (see pp. 7-8 for steps).
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Tanita TBF-531 Body Fat Monitor/Scale
Preparations before use:
Inserting the batteries
1. Open the battery cover on the back of the measuring platform.
Open as shown
Direction of the batteries
2. Insert the supplied AA-size batteries as indicated.
NOTE: Be sure that the polarity of the batteries is set properly. If the batteries are
incorrectly positioned the fluid may leak and damage floors. If you do not intend to
use this unit for a long period of time, it is advisable to remove the batteries before storage.
Positioning the monitor
Place the measuring platform on a hard, flat surface where there is minimal vibration
to ensure safe and accurate measurement.
NOTE: To avoid possible injury, do not step on the edge of the platform.
Attaching the support feet (carpet use only)
Insert the support feet into the holes at the four corners on the bottom of the
measuring platform.
NOTE: Do not use the monitor on any carpeting that is more than 0.8 inches in thickness.
Do not use the support feet on hard, flat surfaces, as the unit may tip over.
Handling tips
This monitor is a precision instrument utilizing state-of-the-art technology. To keep
the unit in the best condition, follow these instructions carefully:
• Do not attempt to disassemble the measuring platform.
• Store the unit horizontally, and place it so that the PERSONAL keys will not be
pressed accidentally.
• Avoid excessive impact or vibration to the unit.
• Place the unit in an area free from direct sunlight, heating equipment, high
humidity, or extreme temperature change.
• Never submerge in water. To clean, use a dampened cloth and mild detergent. Use
alcohol to clean the electrodes.
• When you change the batteries, exchange all four batteries at the same time with
new AA-size batteries.
If you need assistance, please call our toll-free customer service number at 1-800-TANITA-8.
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How to measure body fat percentage
Overview of measuring
To get the most accurate absolute values, measurements should be taken while wearing
no clothing, preferably in the evening, and after urinating. If you do not undress, always
remove your socks or stockings, and be sure the soles of your feet are clean before
stepping on the measuring platform. Stand erect on the platform. If used after bathing,
the body must be completely dry.
NOTE: Accurate measurement will not be possible if the soles of your feet are not clean,
or if your knees are bent or you are in a sitting position.
It is best to take measurements at the same time each day, preferably in the evening.
If doing so is not convenient, remember to wait about three hours after rising, eating,
or hard exercise before taking measurements. While readings taken under other
conditions may not have the same absolute values, they are accurate for determining
the percentage of change as long as the readings are taken in a consistent manner. To
monitor progress, compare weight and body fat percentage measurements taken
under the same conditions over a period of time.
Setting and storing data in memory
The TBF-531 can be operated as a body fat monitor only if data has been pre-programmed
into one of the four PERSONAL keys. The weight only function works independently.
The unit has an automatic shut-down function. If you do not step on the platform after
selecting a PERSONAL key, the unit will automatically shut off in about 30 seconds.
ADULT
CHILD
1. Turn on the power
Use the Set button to turn the unit on. The numbers (1-2-3-4) will appear and the
display will flash.
2. Select a personal number
ADULT
CHILD
Use the Up or Down buttons to select a personal number. After selecting the number,
press the Set button.
ADULT
CHILD
ADULT
CHILD
3. Select Adult or Child
Use the Up or Down buttons to specify Adult/Child, then press the Set button.
Adult (over 18 years old)
Child (up to 18 years old)
Child = up to the age of 18, over 3.6 ft (107 cm)
Adult = age 18 or older
The TBF-531 is not intended for use by persons involved in intense aerobic exercise of at least
10 hours per week and who have a resting heart rate of less than 60 beats per minute.
It is also not intended for professional athletes or bodybuilders who may experience physical
changes due to dehydration.
Female
Male
ADULT
CHILD
ADULT
CHILD
4. Select Male or Female
Press the Up or Down buttons to specify the appropriate gender, then press the Set button.
Female
Male
ADULT
CHILD
ADULT
ft in
5. Specify the height
CHILD
cm
Press the Up or Down buttons to specify the height (hold the button down continuously
for speed setting). Then press the Set button.
ADULT
CHILD
ADULT
CHILD
Once the height is specified, data storage is complete. The display will flash all data
(Adult/Child, gender, and height) for 3 seconds to confirm the programming. The
power will automatically turn off after the confirmation. To set the next PERSONAL
key, repeat steps 1 through 5 after the power shuts off.
ADULT
CHILD
ADULT
ft in
CHILD
cm
For the kg version
For the lb version
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Tanita TBF-531 Body Fat Monitor/Scale
Taking measurements
ADULT
CHILD
ADULT
CHILD
1. Select PERSONAL key
Using your toe, tap the PERSONAL key for the person whose measurement is to be
taken. Release the key within 3 seconds.
ft in
cm
kg
kg
ADULT
CHILD
ADULT
CHILD
lb
lb
NOTE: Do not hold the switch down or the display will show “ error” and the
programmed data will be erased and require resetting.
ADULT
CHILD
ADULT
CHILD
The TBF-531 switches on, and the display shows the programmed data.
ADULT
CHILD
ADULT
CHILD
After 2 or 3 seconds, the display will show “0.0 lb”.
For the kg version
For the lb version
2. Take measurement
Wait for “0.0 lb” to appear before stepping onto the measuring platform.
NOTE: If you do not wait for “ 0.0 lb.” to appear, the display will read “ error”.
Be sure you are barefoot, and that the soles of your feet are clean and dry.
Be sure that your toes and heels are correctly aligned with the toe and heel electrodes
on the measuring platform. Stand erect on the platform.
NOTE: If you do not step onto the measuring platform within about 20 seconds after
“ 0.0 lb” appears, the power shuts off automatically.
Your weight will be shown first. “ooooo” will appear in the display and then the
zeroes will disappear one by one until your body fat percentage is displayed.
Continue to stand erect on the platform. The values of body fat percentage and body
weight will be displayed alternately at 2-second intervals. If you remain on the
platform, the display will continue for about 30 seconds, and then the power will
automatically turn off.
When you step off the platform, the alternating display of body fat percentage and
body weight will be repeated 3 times, and then the power shuts off automatically.
ADULT
CHILD
%
ADULT
CHILD
%
ADULT
CHILD
%
%
ADULT
CHILD
ADULT
CHILD
ADULT
CHILD
lb
kg
Displays for 2 seconds repeatedly
Taking weight measurement only
1. Select weight only key
Using your toe, tap the weight only key to select weight measurement. After 2 or 3
seconds, “88888” will appear in the display and then it will show “0.0 lb”.
2. Take measurement
Step onto the measuring platform.
Be sure that your toes and heels are correctly aligned with the toe and heel electrodes
on the measuring platform.
Tap the weight only key by using your toe
The body weight will appear. If you remain on the platform, the display will flash for
about 30 seconds, and then the power shuts off automatically. If you step off the
platform, the weight will continue to show for about 5 seconds.
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Changing values in memory
Perform steps 1 through 5 in “Setting and storing data in memory” on p. 7.
Replacing the batteries
When the batteries run low, the “Lo” message will appear on the display window.
When this message appears, be sure to replace the batteries immediately, since weak
batteries will affect the accuracy of your measurements.
Your settings will not be erased from the memory when you remove the batteries.
Fresh batteries will last for about one year if a family of four uses the unit once every
day. The unit comes with 4 trial batteries. Their service life will be short.
9
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Tanita TBF-531 Body Fat Monitor/Scale
Troubleshooting
If the following problems occur...
Then...
• Nothing appears in the LCD after
Check foot alignment. Make sure you wait for “0.0 lb” to appear before stepping on
initial display.
the platform. Check to see that the batteries are new and are in the correct position.
• Nothing appears when a PERSONAL key
No data (Adult/Child, gender, height) has been pre-set in memory for that key. Enter data.
is pressed, or
The display shows “- - - - -” and goes off
when a PERSONAL key is pressed.
• The body fat percentage measurement
does not appear after the weight
is measured.
Vibration will interfere with measurement of the fat percentage. Be sure to stand erect
and still on the measuring platform. Do not bend your knees. Be sure that shoes and
socks are removed and check foot alignment. Step off and repeat steps on pp. 7-8.
• The body fat percentage measurement
is extremely low.
Be sure you are measuring in the correct user mode (Adult/Child, gender), and that the
soles of your feet are clean and properly aligned with the guides on the measuring plat-
form. Consider whether or not you are over-hydrated. Step off and repeat steps on pp. 7-8.
• The body fat percentage measurement
is extremely high.
Be sure you are measuring in the correct user mode (Adult/Child, gender), and that
the soles of your feet are clean and properly aligned with the guides on the measuring
platform. Dehydration, exercise, foot calluses, etc. will interfere with measurement of
the fat percentage. Step off and repeat steps on pp. 7-8.
• The display reads “error” instead of the weight.
Wait for “0.0 lb” to appear in the display before stepping onto the platform.
SPECIFICATIONS: TBF-531 BODY FAT MONITOR/SCALE
Unit: lb
300 lb
Unit: st-lb
21st-6lb
Unit: kg
136 kg
Capacity
0-300 lb / 0.5 lb
0-136 kg / 0.2 kg 0-21st-6lb / 0.5lb
Graduation
Fat Percentage
0.5%
DC 6V AA-size (UM3-type) dry battery (x4) included
60 mA maximum
Power Supply
Power Consumption
Measuring Current
UPC No:
After sales service
Please contact the store at which you bought this monitor
for any inquiry regarding operation or trouble, request for
repair and/or placement of an order for parts or products.
Or call 1-800-TANITA-8 (USA and Canada only).
50 kHz 500 µA
TBF-531-LG (Light Grey) 742496-163905
Not for trade use.
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TANITA PRODUCTS LIMITED WARRANTY
Not Valid Without Proof of Purchase
Your Tanita product is warranted to the original consumer only, for one (1) year, to be free from defects in materials and work-
manship under normal use. This product is designed for Personal use only. Tanita Corporation of America reserves the
right to nullify the warranty agreement should the product be used in a commercial environment. This warranty is void if the
product has been tampered with or mistreated, or if the defect is related to servicing or parts not supplied by us. Our obliga-
tion under this warranty is limited solely to the charge of repairing the product, plus the cost of parts or, at the option of Tanita,
replacing the product with an equivalent model. There are no express or implied warranties except as listed above. Tanita is
not liable for incidental or consequential damages for failure or malfunction of the product and any recov-
ery may not be greater than the purchase price paid for this product. Some states do not allow limitation on how
long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the above limitations
may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state
to state. No person is authorized to change the terms of this warranty.
IF PRODUCT IS DEFECTIVE OR NEEDS REPAIR
Do not return this product to the place of purchase; doing so may delay the processing of your warranty claim.
Call Tanita at: 1-800-TANITA-8 to receive a Return Authorization Number before returning this product. Include $12.50 for
handling, return postage and insurance to the facility listed below. Proof of purchase must accompany the product.
Because of possible loss, we recommend insuring your product, return receipt requested, when using the mail. If you do not
receive a receipt within a reasonable time, start a tracer through the originating post office. It is important that you pack the
product carefully prior to shipment to prevent damage in transit and that you include a letter describing in detail the specific
condition requiring adjustment or repair.
TANITA PRODUCTS LIMITED AFTER WARRANTY
All terms and conditions apply as specified above in the original Tanita Limited Warranty except for the cost of labor and parts:
• Minimum charge for After Warranty labor is $30 per hour, plus the cost of parts.
• You will be notified by mail or telephone of the total cost to repair your product to working condition, so prepayment can
be arranged.
• Your approval is required before any repair work can be performed on your product.
Please complete the following information and retain for your records.
MODEL:
DATE PURCHASED:
/
/
PURCHASED FROM:
ADDRESS:
Please send all returns to:
Tanita Corporation
2625 S. Clearbrook Drive
Arlington Heights, IL 60005 USA
AStepToward A Healthier Life.
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©1998 Tanita Corporation 5/98 HDI
TANITA Corporation
TANITA Corporation of America Inc.
2625 S. Clearbrook Drive
Arlington Heights, IL 60005 USA
Tel. 847-640-9241 Fax 847-640-9261
Toll Free 1-800-TANITA-8
http:// WWW.TANITA.COM (English)
http:// WWW.TANITA.CO.JP (Japanese)
14-2, 1-Chome, Maeno-Cho
Itabashi-Ku, Tokyo, Japan
Tel. 03-3968-2123 Fax 03-3967-3766
ISO 9001 Certified
TANITA UK Ltd.
TANITA France S.A.
3-3 Bis, Rue Charcot 92200
Neuilly-sur-Seine, France
Tel. 01-5524-9999
TANITA Health Equipment H.K. Ltd.
Unit 301-303 3/F Wing On Plaza
62 Mody Road, Tsimshatsui East
Kowloon, Hong Kong
TANITA Europe GmbH
Dresdener Strasse 25
D-71065 Sindelfingen, Germany
Tel. 07031-61896
Tanita House, Willow Avenue, Denham
Uxbridge, Middlesex UB9 4AF, Great Britain
Tel. 01895-232355
Fax 01895-233116
Fax 01-5524-9868
Tel. 852-2838-7111 Fax 852-2838-8667
Fax 07031-618971
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