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INSTRUCTION MANUAL
Model 
HBF-306
Thank you for purchasing 
the OMRON Body Fat Analyzer. 
Before using this unit for the first
time, please be sure to read this
instruction manual carefully and
use the unit properly. 
Please keep this instruction manual
on hand for future reference. 
BODY FAT
ANALYZER
Table of Contents
Notes on Safety  . . . . . . . . . . . . . 2
Features of the Product  . . . . . . . 4
Names and Functions 
of the Parts  . . . . . . . . . . . . . . . . . 5
How to Insert and Replace 
the Batteries  . . . . . . . . . . . . . . . . 7
How to Measure  . . . . . . . . . . . . . 8
Set the Personal Data . . . . . . . . . . . . . . 8
Start the Measurement . . . . . . . . . . . . 12
How to Interpret the 
Measured Results . . . . . . . . . . . . . . . . 14
How to Care for and 
Store the Unit . . . . . . . . . . . . . . 15
Troubleshooting  . . . . . . . . . . . . 16
What You Should Know When
Using this Unit  . . . . . . . . . . . . . 17
For a Correct Measurement  . . . 20
Specifications  . . . . . . . . . . . . . . 23
Caution  . . . . . . . . . . . . . . . . . . . 24
Limited One Year Warranty  . . . 25
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Notes on Safety
Please read this section carefully before using the unit.
2
Notes on Safety
• The warning signs and the sample icons shown here are listed 
in order for you to use this product safely and correctly as well 
as to prevent risk and injury to you and others. 
• The icons and meanings are as follows:
Indicates matters in which an imminent risk of death 
or serious injury may arise as a result of incorrect handling.
Indicates matters in which the possibility of death 
or serious injury may arise as a result of incorrect handling.
Indicates matters in which bodily harm or material damage
may arise as a result of incorrect handling.*
The 
icon indicates prohibitions (what you should not
do). Matters involving actual prohibitions are indicated 
by text or pictures in or near 
The icon to the left refers to "prohibition to disassemble".
The 
icon indicates something that must be followed.
Matters involving actual compulsory actions are indicated
by text or pictures in or near 
The icon to the left refers to "general notice".
*Material damage refers to a wide range of damage involving
your house, household goods, domestic animals, and pets.
Examples of signs
Never use this unit in combination with the following 
medical electronic devices. 
(1) Medical electronic implants such as pacemakers. 
(2) Electronic life support systems such as an artificial heart/lung. 
(3) Portable electronic medical devices such as an electrocardiograph.
• This unit may cause the above mentioned medical 
electronic devices to malfunction.
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Notes on Safety
3
Notes on Safety
Never start weight reduction or exercise therapy without 
the instructions of a physician or a specialist.
• Self-diagnosis may damage your health condition.
• Consult with your physcian before using when pregnant.
Do not disassemble this unit. You may be injured or damage the unit. 
Do not use this unit when your body and/or fingers are wet, 
such as after taking a bath. 
Do not place this unit in a highly humid environment, where water 
may splash, in direct sunshine, in a place where the air from 
air conditioning hits directly, or near fire. 
Do not wash this unit with water. 
As this unit is a precision instrument, do not drop, vibrate, 
or apply strong shock. 
Do not use batteries not specified for this unit. Do not insert the batteries 
with the polarities in the wrong direction.
General Advice
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Features of the Product
4
Features of the Product
Easy-to-Understand Display 
The unit displays the measured value of body fat percentage by the BI
method and indicates the body mass in four ranges of LOW, NORMAL, 
HIGH, and VERY HIGH according to the BMI value. 
BI method: Bioelectrical Impedance method (see page 5)
BMI: Body Mass Index = (weight (lbs) x703) / height (in) / height (in) 
BMI: Body Mass Index in metric = weight (kg) / height (m) / height (m)
NORMAL or ATHLETE mode can be selected 
for a more accurate measurement.
Measurement is fast and simple.
After inputting the data, a measurement can be started by simply holding 
the grip electrodes and pressing the Start button. The measured results are
displayed approximately 7 seconds after the START symbol is displayed. 
The measured results are shown in an easy-to-see display.
Body fat percentage and body mass index are shown simultaneously 
in an easy-to-see large digital display and a bar display that 
can be read at a glance. 
The memory function stores up to 9 personal profiles  
The memory function can store up to 9 people's information 
(height, weight, age, and gender). 
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Names and Functions of the Parts
5
Names and Functions of the Parts
Main unit
Grip electrodes 
Extremely weak electrical
current is sent from here
during the measurement.
On/Off button 
Turns the power
on and off.
Battery cover
Set button 
Sets the personal
number and the
personal data.
Up / Down button 
Sets the numerical values for personal information
including height, weight, age and gender. This button 
is also used to set the personal numbers from 1 to 9. 
Display 
Displays the set values
and the measured results.
Start button 
Press the button and 
the measurement starts.
Grip electrodes
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Names and Functions of the Parts
6
Names and Functions of the Parts
Display
Height / weight / age mode
Athletic level
Body fat percentage /
height / weight / age
Ready to measure 
Gender
Personal No.
GUEST
Measurement
progress / BMI
classification bar
BMI 
Low battery
indicator 
(
When this symbol 
flashes, replace 
the batteries.)
How to change the unit to metric mode:
1. Simultaneously push the On/Off, the Start, and the Up buttons. 
The power turns on and the bottom LCD should read USA.
(If the LCD says “guest”, turn the unit off and try again.) 
2. Push the Set button and the LCD changes. 
3. Push and hold the Set button again for 3-4 seconds 
until the upper LCD changes to “CAl”. At this time, 
all personal data are deleted. 
4. Push the On/Off button to turn off the power. 
• In this mode, the power does not turn off 
automatically. Be sure to turn off the power. 
5. Push the On/Off button to turn on the power. 
The display unit changes to the metric system. 
• To return to US display, repeat the same procedure.
Starting to measure