Yamato Clock MINI DF301 User manual

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Clock & Body Fat Monitor
Operater’s Manual for
Clock MINI DF301
Clock NAVI DF311
Thank you for purchasing the Yamato Clock and Body Fat Monitor.
Please read this manual before using your body fat monitor to ensure safe
and correct operation.

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Important Information 1
Description
Indications for Use
Contraindications
Warnings, Cautions and User Care 2
Body Fat Estimation 4
What is body fat?
How can you detect body fat?
The BIA method of estimating body fat
Body fat percentage
Body Mass Index (DF311)
Body fat levels
More reliable readings
Features of the ClockMINI/ClockNAVI 6
Names and Functions 7
Display Screen 8
Clock mode display
Body fat monitor mode display
Set-up 9
Selecting units
Clock Feature 10
Setting the time
Selecting the 12/24 hour clock and primary/secondary time (DF311)
Setting the secondary time (DF311)
Setting the alarm
Using the timer
Personal Data Storage 12
Temporary data
Permanent data
Estimating Body Fat Percent 13
Correct Use of the Body Fat Monitor 14
Troubleshooting & Error Messages 15
Changing the Batteries 16
Specifications 17
Table of Contents

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Contraindications
Never use the Yamato ClockMINI or ClockNAVI with any of the following electronic medical de-
vices:
Implanted electronics such as a pace maker.
Electronic life support equipment such as a respirator.
Bio-monitoring equipment such as an electrocardiograph.
Using this unit in combination with the electronic medical devices mentioned above can cause
interference with the operation of the medical devices.
To ensure the safety of unborn children, pregnant women should not use the Yamato ClockMINI
and ClockNAVI devices to estimate body fat percent. The effects of electrical current on the fetus
are not known.
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Important Information
The ClockMINI (DF301) and ClockNAVI (DF311) combine a body fat monitor with a clock in a compact
device that can be conveniently carried. The devices utilize the measurement of bioelectric impedance
to estimate the body fat percent of the user. Because impedance is measured through the fingertips, the
user does not need to remove his or her clothing. The devices provide the following functions: estima-
tion of body fat percent, calculation of body mass index (ClockNAVI only),determination of body fat level,
time of day, alarm and timer. The devices store personal data for several users or for one user over a
period of time.
Before using the ClockMINI (DF301) or ClockNAVI (DF311), please note the following safety information.
Indications for Use
The Yamato ClockMINI and ClockNAVI clock and body fat monitors are intended for use in the
estimation of body fat percent in users aged 10 to 80 years.

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WARNINGS
ClockMINI (DF301) / ClockNAVI (DF311) utilizes a liquid crystal display which may leak a toxic fluid if the
display is broken or cracked. This fluid may be harmful or fatal if swallowed.
Use only the batteries specified in this manual and do not mix new and old batteries. Failure to do so
could cause batteries to explode, or liquid leakage could occur resulting in damage to the device.
Do not place device or batteries in an area where children have access. Swallowing of liquid from
breakage of batteries can be harmful or fatal.
When putting batteries in the ClockMINI (DF301) / ClockNAVI (DF311), position each with the correct
polarity as indicated. Incorrect positioning could result in an explosion, fire, injury to a person, or
damage to the device.
Dispose of the unit or batteries in accordance with local or national regulations for environmental
protection.
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The body fat estimation functions of the ClockMINI (DF301) / ClockNAVI (DF311) should not be used by
themselves to indicate changes in diet or exercise. Always consult a physician prior to changing your
diet or starting an exercise program.
When using the ClockMINI (DF301) / ClockNAVI (DF311), please note that for the following groups of
people, the body fat percent estimated by this unit may significantly differ from actual body fat percent:
• Pregnant women
• Children under 10 years old
• People 80 years old and older
• Professional or semi-professional athletes
• People with a fever
• Dialysis patients
• Dropsy patients
• Osteoporosis patients
Body fat percent estimates for these groups of people may vary significantly from actual body fat.
The following activities prior to using this device could result in inconsistent or inaccurate estimation of
body fat:
• Excessive eating or drinking.
• Hard exercise.
• Taking a bath or shower.
The most repeatable results from the ClockMINI (DF301) / ClockNAVI (DF311) will be obtained if you
use the device at the same time each day, and if you ensure that your fingers are not overly dry when
performing the estimation.
Take out the batteries when ClockMINI (DF301) / ClockNAVI (DF311) is not used for extended periods of
time. Liquid leakage could result in internal corrosion and damage to the device.
CAUTIONS

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Clean you ClockMINI (DF301) / ClockNAVI (DF311) with a damp cloth and household detergent. Do not
use benzene, gasoline, or alcohol.
CAUTIONS
Care for Your DF301 / DF311
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Do not disassemble ClockMINI (DF301) / ClockNAVI (DF311). This could result in damage to the device
or malfunction.
Do not place the ClockMINI (DF301) / ClockNAVI (DF311) at temperatures in excess of 60° C, or
humidity in excess of 95% for extended periods of time, damage to the unit could result.

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Body Fat Estimation
What is Body Fat?
Body fat, like protein, carbohydrates, vitamins and minerals, is an important nutrient. It stores energy
for the body’s use, helps maintain body temperature and helps cushion and protect the internal
organs. However, too much body fat can result in life-style related diseases.
How Can You Detect Body Fat?
People with a muscular build, such as athletes, can have a relatively high weight with little body fat.
Those with a less muscular build may weigh less, appear slim and still have a significant amount of
fat. Indeed, people of an average build and weight may have a percentage of body fat high enough
to be considered obese. The amount of body fat cannot necessarily be determined by weight and
build.
Body fat can be measured accurately, for example, by calculating the specific gravity of a person
from their weight in water, or by using an ultrasound measuring device. These methods, however,
require special equipment and are relatively expensive.
The BIA Method of Estimating Body Fat
Yamato’s Body Fat Monitors use bioelectric impedance analysis (BIA) to estimate the percentage
of body fat. This popular method utilizes a small, imperceptible ~50 kHz, 500uA current through the
body to measure its resistivity. The higher the percentage of body fat, the higher the resistivity. This
value is then used in combination with weight, height, age and gender to estimate the percentage of
body fat.
Body Fat Percentage
Body fat percentage is the ratio of body fat weight to total body weight multiplied by 100. In general,
body fat percent of 20% or more for men and 30% or more for women is considered overweight.
Body fat percentage (%) = [Body fat weight (kg / lb)] / [Total body weight (kg / lb)] * 100
Body Mass Index (DF311)
The body mass index (BMI) is also frequently used to evaluate obesity. While more accurate than
weight tables, a person with a very muscular build and low body fat can have the same BMI as an
obese person. However, the ClockNAVI (DF311) calculates your BMI for your convenience. BMI is
the ratio of a person’s weight to the square of their height.
BMI = [Weight (kg)] / [Height2(m)]
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Body Fat Levels
The ClockMINI (DF301) / ClockNAVI (DF311) uses the BIA method to calculate an estimate of
your body fat percentage through a correlation formula that has been developed on the basis of
scientific tests conducted by Yamato.
Unfortunately, while several standards have been proposed, there is no consensus as to what
ideal body weight, BMI or body fat percentage should be. Your ClockMINI (DF301) / ClockNAVI
(DF311) groups your body fat level into one of four categories (Low, Average, High and Very High)
according to the chart below.
Level Low Average High Very High
Level
Indication
Body Fat % Male 10.4% or less 10.6% ~ 20.8% 21.0% ~ 26.8% 27.0% or more
Female 21.8% or less 22.0% ~ 32.8% 33.0% ~ 38.8% 39.0% or more
BMI M / F 19.9 or less 20.0 ~ 24.9 25.0 ~ 29.9 30.0 or more
Body Fat Estimation
The following activities prior to using this device could result in inconsistent or inaccurate estimation
of body fat.
• Excessive eating or drinking.
• Hard exercise.
• Taking a bath or shower.
The most repeatable results from the DF301 / DF311 will be obtained if you use the device at the
same time each day, and if you ensure that your fingers are not overly dry when performing the
estimation.
For More Reliable Readings
Since the Yamato ClockMINI (DF301) / ClockNAVI (DF311) use the BIA method, the readings are
influenced by body water content. The body’s daily water balance can be affected by several lifestyle
factors including: the nature of your work, physical exercise, eating, drinking, physical condition, etc.
ClockMINI (DF301) / ClockNAVI (DF311), like all devices that use BIA, will give the most consistent
results when the body water content is the same.
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CAUTIONS

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Features of the ClockMINI / ClockNAVI
• The ClockMINI and Clock NAVI combine a body fat monitor with a fully functional clock.
• The alarm function is useful for measuring at a certain time of day and can remind you to check your
body fat percent at the same time of day, leading to more reliable results.
• The compact size of the device makes it convenient for you to estimate your body fat at any time or
place.
• It is easy to handle, measures quickly, and display information in seconds.
• It measures at your fingertips. You do not have to remove your clothing.
• The ClockMINI provides estimation of body fat percent and displays body fat level based on body fat
percent.
• The ClockNAVI provides an estimate of your body fat percentage, display of body fat level based on
the body fat percent, calculation of Body Mass Index (BMI), and display of BMI level.
• Both store personal data (weight, height, age, gender and previously estimated body fat percentage)
of up to nine people for the DF311 or up to four people for the DF301. You can set it to store multiple
previously estimated body fat percentages.
• The ClockMINI / ClockNAVI can be used to track your progress in reducing your body fat percent.
• It uses the latest technology in Bioelectrical Impedance Analysis (BIA) to estimate body fat percent.
• When used as directed, the current delivered by the ClockMINI / ClockNAVI is safe and cannot be felt
by the user.
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Names and Functions
Finger electrode
A weak current passes through your fingers when
measuring.
Display
Shows set values and measured values.
[Body fat monitor mode]
Body fat levels
START button: Starts measuring.
FAT%/SET button: Enters data and advances to the
next setting.
T(Down) button: Used to set personal data.
S(Up) button: Used to set personal data.
CLOCK button: Switches to the clock mode.
[Clock mode]
FAT%/SET button: Switches to the body fat monitor
mode.
TIMER/T(Down) button: Selects timer mode.
Used to set timer.
ALARM/S(Up) button: Selects alarm mode.
Used to set alarm time.
CLOCK button: Cyles time display.
Enables time setting.
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Clock Mode Display
* The time is shown in clear, large numerals.
* The moving pendulum indicates the clock is being displayed.
* The time can be shown in either 12 or 24 hour mode.
* indicates the DF311secondary time is being shown. The primary time must be set before the
secondary time can be set.
* A steady indicates the alarm is set.
* A flashing indicates the timer is in use or the alarm is being set.
Body Fat Monitor Mode Display
The body fat ratio and the body fat level are shown together. The large numerals make it easy to read
the body fat ratio.
Display Screen
Turns on when the secondary
time is displayed (DF311 only).
Select a 12 or 24 hour clock.
Select primary or secondary time (DF311 only).
Displays AM or PM.
when in 12 hour mode.
Moves like a pendulum
in clock mode.
Shows the alarm is on
or the timer is running.
Alarm melody number.
Displayed when the alarm is set.
Indicates BMI is being
displayed (DF311 only).
Body fat ratio.
Shows, approximately,
the percentage of the
total body weight that
is body fat.
Personal register
(ID) number.
Body fat level.
Indicates underweight,
normal, overweight or
obese body fat level.
Based on the estimated
body fat percentage.
Indicates the body fat
ratio is being displayed.
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