TBF-621BODYFAT
MONITOR/SCALE
Instruction Manual
Read this Instruction Manual carefully
and keep it for future reference.
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English: Instruction Manual
Introduction
Thank you for selecting the Tanita Body Fat Monitor/Scale TBF-621.
This two-memory model uses the BIA (Bioelectrical Impedance Analysis)
technique, a state-of-the-art technology for body fat assessment.
Safety Precautions
• Persons with implanted medical equipment, such as a pacemaker, should not use the
TBF-621. This Body Fat Monitor/Scale passes a low-level electrical signal through the body,
which may interfere with the operation of a pacemaker.
• The Tanita Body Fat Monitor/Scale TBF-621 is intended for home use only. This unit is not
intended for professional use in hospitals or other medical facilities; it is not equipped with
the quality standards required for heavy usage experienced under professional conditions.
• Do not use this unit on slippery surfaces such as wet floors.
• Disabled people should be assisted by someone else, or use a handrail when using
the TBF-621.
Note: Body fat percentage estimates will vary with the amount of moisture in the body,and can be affected
by dehydration or overhydration due to such factors as alcohol consumption, menstruation, illness, intense
exercise, etc.
Important Notes for Users
The TBF-621 is intended for use by adults and children with moderately active to inactive
lifestyles. It is not intended for people with athletic body types.
Tanita defines “athlete” as a person involved in intense physical activity of at least 10 hours
per week and who has a resting heart rate of approximately 60 beats per minute or less.
Tanita’s athlete definition includes “lifetime of fitness” individuals who have been fit for
years but currently exercise less than 10 hours per week.
Tanita’s athlete definition does not include “enthusiastic beginners” who are making a real
commitment to exercising at least 10 hours per week but whose bodies have not yet changed
to require the Athlete mode.
People with athletic body types should use Tanita Body Fat Monitor/Scales equipped with
Athlete mode.
Body fat percentage estimates may be slightly lower or higher for the following categories
of people:
• Adults seventy years old or older
• Persons undergoing dialysis
• Persons suffering from edema
Body fat percentage estimates for these persons should not be treated as absolute values, but
may be used as relative values for checking body fat percent variations over a period of time.
The body fat monitor function of the TBF-621 is not intended for pregnant women,
professional athletes or bodybuilders.
Recommendations for exercise programs or diets based on calculated data should be
determined by a doctor or licensed medical professional. Do not attempt to evaluate the data
by yourself.
Recorded data may be lost if the TBF-621 is used incorrectly or is exposed to electrical power
surges. Tanita takes no responsibility for any kind of loss caused by the loss of recorded data.
Tanita takes no responsibility for any kind of damage or loss caused by these units, or any
kind of claim made by a third person.
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TBF-621 Body Fat Monitor/Scale
Principles of Estimating Body Fat Percentage
The Tanita Body Fat Monitor/Scale TBF-621 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.
The chart below shows reasonable ranges of body fat percentage.
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-621 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 measuring
the impedance. The signal used is very low, making it safe and imperceptible.
Tanita’s patented “foot-pad” design sends a safe,
low-level electrical signal through the body to
determine its composition.
The illustration on the left show how the signal travels through the body.
Body Fat Percentage Fluctuations in a Day
Body Fat %
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.
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21
20
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.
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18
17
6am
10am
2pm
6pm
10pm Time
The graph on the left shows an example of daily body fat percentage fluctuations.
Daily fluctuations in body fat percentage based on
the BIA technique.
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Advantages of the Tanita TBF-621
Previously, body fat percentage was determined by measuring the thickness of subcutaneous
fat by pinching it with calipers, or by laying a person on a scanning bed and passing a current
from hand to foot. However, these methods present problems—professional skills are
required, the procedures take time and are often invasive, and measurement values vary.
Currently, the gold standard methods of fat percentage measurement are DEXA (dual energy
x-ray absorptiometry) and Hydrodensitometry (underwater weighing).
Tanita’s BIA method uses equations derived from large, multi-ethnic population studies to
predict body composition. Readings taken with Tanita’s TBF-621 correlate highly with both
DEXA (Tanita’s reference model) and Hydrodensitometry.
Features and Functions
Components
Measuring Platform
Support Feet (4)
Batteries (4)
This Instruction Manual
Educational Booklet
“Getting Started” Workbook
Measuring Platform
1. Display Screen
2. Orange Set Button
3. Green Arrow (Select) Button
4. Ball-of-Foot Electrodes
5. Heel Electrodes
1
3
2
6. Personal Keys (Start Switches)
Setting of Adult or Child, Male or
Female, and Height for two
persons can be stored in the
memory of the unit.
4
5
Accessories
7. Support Feet (4)
6
Only needed if unit is placed
on carpet. Do not use these feet
on hard flooring.
8. Batteries (4)
8
7
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TBF-621 Body Fat Monitor/Scale
Useful Features of the TBF-621
• The TBF-621 allows you to measure both weight and body fat percentage simultaneously as
easily and simply as stepping on a scale.
• The TBF-621 can be set for an Adult or Child, Male or Female, increasing the accuracy of
the reading.
• Personal data (Adult/Child, Male/Female and Height) are stored in the memory of the unit.
Switching the Weight Mode
The TBF-621 can measure weight in three different modes: lb (pounds), kg (kilograms) or st-lb
(British stone-pounds). The default setting (the setting at which Tanita products are shipped) is
lb. If you would like to change that setting, or if at any point another setting has been
inadvertently entered, follow these steps:
Press
to cycle through each weight mode until just the mode that you require is displayed. Then
press . The display screen will flash to confirm your selection and store it in memory.
and
simultaneously. Release the buttons, the display will flash. Press
Note: If weight mode is set to pounds or stone-pounds, the height programming mode will be automatically
set to feet and inches. Similarly, if kilograms is selected, height will be automatically set to centimeters.
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 or button operation.
• After you have completed the measuring process.
Note: If the power shuts off unexpectedly, repeat the measuring process.
Open as shown
Direction of the batteries
Preparations Before Use
Inserting the Batteries
1. Locate the battery cover on the back of the measuring platform. Press the tab to release the
cover as shown.
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 monitor 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
m easuring platform .
Note: Do not use the monitor on any carpeting that is more than 0.8" (20 mm) in thickness.
Do not use the support feet on hard, flat surfaces, as the unit may tip over.
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Setting and Storing Data in Memory
The TBF-621 can be operated only if data has been preprogrammed into one of the two
Personal keys. Once programmed, tapping a Personal key turns the monitor on. The unit has
an automatic shut-down function. If you do not step on the platform after pressing a
Personal key, the unit will automatically shut off in about 30 seconds.
The TBF-621 is intended for use by adults and children who have moderately active to
inactive lifestyles.
The TBF-621 is not intended for use by persons with athletic body types. (See p.1 for Tanita’s
definition of “athlete.”)
1. Turn on the Power
When programming data, use the Orange Set button to turn the unit on. The register
numbers (“1 or 2”) will appear and the display will flash.
Turn the unit on.
2. Select a Personal Key
Use the Green Arrow button to select a Personal key, then press the Orange Set button.
3. Select Adult or Child
Select “1 or 2.”
Store in memory.
Store in memory.
Store in memory.
Use the Green Arrow button to specify Adult or Child, then press the Orange Set button.
Adult = age 18 or older, who has moderately active to inactive lifestyle.
Child = up to the age of 18, over 3' 4" (102 cm), who has moderately active
to inactive lifestyle.
4. Select Male or Female
Select Adult
or Child.
Use the Green Arrow button to select Male or Female, then press the Orange Set button.
(
) Male
(
) Female
5. Specify the Height
Use the Green Arrow button to specify Height. Then press the Orange Set button.
Select Male
or Female.
The display will flash all data (Adult/Child, Male/Female and Height) for three seconds to
confirm the programming. The power will automatically turn off.
Getting Accurate Readings
To get the most accurate absolute values, readings should be taken without clothing and
under consistent conditions of hydration. 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.
Female
Male
Note: An accurate reading 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.
Specify Height.
Store in memory.
It is best to take readings at the same time of day. 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 taken under the same conditions over a
period of time.
Confirmed data will flash for three seconds.
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TBF-621 Body Fat Monitor/Scale
Taking Readings
1. Turn on the Power
Using your toe, turn the unit on by tapping your Personal key. Release the key within
three seconds.
Your preset data will appear (Adult/Child, Male/Female and Height).
Immediately after your preset data, the display will show “0.0.”
Turn the unit on by tapping your Personal key.
2. Take Reading
Wait for “0.0” to appear before stepping onto the measuring platform.
Your preset data will appear.
Wait for “0.0” to appear and step on.
Your weight will be shown first.
Note: If you step on before “0.0,” you will not receive a reading.
Be sure you are barefoot, and that the soles of your feet are clean and dry.
Be sure that the heel and ball of each foot is directly on top of the electrodes on the
measuring platform. Stand erect on the platform. Accurate readings can still be obtained
even if your toes overhang the platform.
Note: If you do not step onto the measuring platform within about 20 seconds after “0.0” appears, the power
shuts off automatically.
Your weight will be shown first. The numbers 5, 4, 3, 2, 1 will appear on the display. The
numbers will disappear, and your body fat percentage will be displayed.
Continue to stand erect on the platform. The values of body fat percentage and body weight
will be displayed alternately at two-second intervals. If you remain on the platform, the
display will continue for about 30 seconds, and then the power will automatically turn off.
Your body fat percentage will be displayed.
If you step off the platform, the alternating display of body fat percentage and body weight
will be repeated three times, and then the power will automatically turn off.
Multiple Users
The unit may be used by more than two persons. Simply repeat the programming process.
(Steps 1 through 5 of Setting and Storing Data in Memory.)
Note: Previously stored data will be erased in the Personal key.
Replacing the Batteries
When the batteries run low, the “Lo” message will appear in the display window. When this
message appears, be sure to replace the batteries immediately, since weak batteries will
affect the accuracy of your readings.
Your setting will not be erased from the memory when you remove the batteries.
Batteries run low.
New batteries can last for about one year if the unit is used once every day. The unit comes
with trial batteries; their service life may be short.
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Handling Tips
Specifications
TBF-621
This monitor is a precision instrument utilizing state-of-the-art technology. To keep the unit
in the best condition, follow these instructions carefully:
Weight Capacity
• Do not attempt to disassemble the measuring platform.
300 lb (136 kg) (21 st-6 lb)
• Store the unit horizontally, and place it so that the Personal keys will not be
pressed accidentally.
Weight Increments
0.5 lb (0.2 kg) (0.5 lb)
• Avoid excessive impact or vibration to the unit.
Body Fat Increments
1%
• Place the unit in an area free from direct sunlight, heating equipment, high humidity, or
extreme temperature change.
Power Supply
• Never submerge the unit in water. Use alcohol to clean the electrodes and glass cleaner to
keep them shiny, applied to a cloth first; avoid soaps.
DC 6V AA-size (UM3-type) battery (x4)—included
Power Consumption
60 mA maximum
• When you change the batteries, exchange all four at the same time with new batteries.
Measuring Current
50 kHz 500 µA
Troubleshooting
If the following problems occur... then...
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).
“ st-lb” or “ kg” appears while taking a weight measurement.
The unit’s “Weight Mode” has been set to measure your weight in units of stone-pounds
or kilograms. Refer to the Switching the Weight Mode (lb, kg, or st-lb) on p.5 if you would
like to change the setting back to pounds (lb).
Nothing appears in the display screen after initial display of preset data.
Check foot alignment. Make sure you wait for “0.0” to appear before stepping on the
platform. Check to see that the batteries are fresh and are in the correct positions.
Nothing appears when a Personal key is pressed, or the display shows “ - - - - -”
and goes off when a Personal key is pressed.
No data (Adult/Child, Male/Female or Height) has been stored in the memory of that
Personal key.
The body fat percentage reading does not appear after the weight is measured.
Vibration will interfere with the fat percentage reading. 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 p.6.
The body fat percentage reading is extremely low/extremely high.
Be sure you have selected the correct user mode (Adult/Child, Male/Female), and that the
soles of your feet are clean and properly aligned with the guides on the measuring platform.
Consider whether or not you are overhydrated. Step off and repeat steps on p.6. Dehydration,
foot calluses, etc. will interfere with the fat percentage reading. Step off and repeat steps on p.6.
If you need assistance, please call our toll-free customer service number at 1-800-TANITA-8
(USA and Canada only).
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TBF-621 Body Fat Monitor/Scale
Tanita Products Limited Warranty
Not Valid Without Proof of Purchase
Your Tanita product is warranted to the original consumer only, for three (3) years, to be free from defects in materials and
workmanship 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
obligation 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 recovery 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 at1-800-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
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©2000 Tanita Corporation 7/00 HDI
www.tanita.com
Tanita Corporation of Japan
14-2, 1-Chome, Maeno-Cho
Itabashi-Ku, Tokyo, Japan 174-8630
Tel: 03-3968-2123
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
Fax: 03-3967-3766
ISO 9001 Certified
e-mail: 4health@tanita.com
Tanita France S.A.
Villa Labrouste
68 Boulevard Bourdon
92200 Neuilly-Sur Seine
Tel: 01-5524-9999 Fax: 01-5524-9868
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 UK Ltd.
The Barn, Philpots Close, Yiewsley,
West Drayton, Middlesex, UB7 7RY, UK
Tel: 01895-438-577
Tel: 852-2838-7111 Fax: 852-2838-8667
Fax: 07031-618971
Fax: 01895-438-511
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