Lazle GBF-830M Glass Body fat Analyzer User Manual


Lazle GBF-830M Glass Body Fat Analyzer User Manual


Safety Information


The Glass Body Fat Analyzer GBF-830-M offers its users a seamlessly easy way to manage and keep track of their health. Kindly note that this device is intended for healthy persons over the age of 10 ONLY. This device is in no way intended as a treatment, cure, or pre-prophylaxis for any disease or ailment. Kindly contact your physician for more related information.

Please note: The use of cables, transducers, or accessories other than those provided, except transducers and cables sold by the manufacturer as replacement parts for internal components, may result in increased EMISSIONS and decreased IMMUNITY of the device. Nearby portable and mobile RF-communications equipment can affect the performance of the Glass Body Fat Analyzer. Kindly use this device according to the user manual. Any misuse of this device can cause electric shock, burns, fire, and other hazards. Do not use this device in flammable gas environments.

Do not use the analyzer adjacent to or stacked with other equipment. The manufacturer will make available on request circuit diagrams, components lists, etc. WARNING: Modifications to this device are NOT permitted. While using the analyzer, the patient should remain in steady contact with the surface of the electrodes till the measurement is complete. The platform and the analyzer’s electrode are type BF Applied parts. This device does not need to be recalibrated till after five years. Do not touch the batteries while using the analyzer.


This device is designed to evaluate body weight, body fat, BMI, total body water percentage, muscle mass, and bone mass in generally healthy children between ages 10-17 and adults. It is suitable for home use ONLY.


  1. This device is not intended for use on pregnant or suspected pregnant women. Besides the possibility of obtaining inaccurate results, the effect of this device on the fetus is unknown. Thus, (suspected) pregnant women should contact their doctor before using this device.
  2. This device should not be used on any person connected to a wearable or implantable electronic device or instrument, such as a pacemaker or defibrillator.
  3. This device should not be used on anyone who is chronically ill, especially with diseases, or on medications that might affect their water levels.
Your Scale and Its Environment

To ensure your safety, as well as the full-service life of your scale, kindly avoid using the scale in the following situations:

  • Slippery floors, such as tiles.
  • Immediately after a bath or with wet hands.
  • Near a cell phone or a microwave.
  • This device is designed for use in the home healthcare environment
  • This device is not intended for use in an oxygen-rich environment.

Avoid storing this device in the following locations:

  • On wet surfaces.
  • Under extreme conditions, such as excess temperature, heat, humidity, dust, salty air, etc.
  • Where there is a risk of shock or drop.
  • In locations of chemicals or corrosive gases.
  • Within children’s reach


Product Outline


Inbox Content 

  • x1 BodyfatScale
  • x4 1.5V AAA Batteries
  • x1 User Manual

Display Outline



Initial Start-Up

The Body Analyzer uses BIA technology which passes a small amount of weak current through the body to estimate body fat mass, muscle mass, total body water, and other weight components. Contact with the body is made via the stainless steel pads (electrodes) on the scale. The scale simultaneously calculates your body fat percentage, total body water percentage, bone mass, and muscle mass while measuring your body weight, for a more accurate reading of your overall health and fitness.


Preparing Your Body Analyzer

  • Open the battery compartment on the underside of the scale.
  • Correctly – in the right polarities, insert the batteries (x4 AAA) into the battery compartment.
  • Close the battery compartment.
  • Wait until the digits “0.0” are displayed on the LCD screen.
  • Press the “Unit” button on the underside of the scale to select the desired measurement unit; either pound, kilogram, or stone. The default measurement unit is the kilogram (kg).
  • When the symbol “Lo” appears, the device will power off after about 4s. Then you shall replace it with a new set of batteries. Please replace all four batteries at the same time. Do NOT mix the old batteries with the new ones.
  • Worn batteries are hazardous waste. Do NOT dispose of them together with the household garbage.
  • Please refer to the local ordinances and recycling instructions regarding disposal of the worn batteries and scrapped devices.
  • If you do not intend to use this unit for a prolonged period of time, it is advisable to remove the batteries before storing them.
  • Do not mix alkaline, standard (carbon-zinc), or rechargeable (Ni-Cd, Ni-MH, etc) batteries.
  • At least 2 hours are required for the device to warm / cool from the minimum / maximum storage temperature between uses until it is ready for intended use when the ambient temperature is 20 C.

Select Measurement Unit
With batteries correctly installed, press the “UNIT” button on the back of the scale to select the measurement unit. The default measurement unit is “kg”. You may press the “UNIT” button to choose between kilogram, pound, and stone.


Setting Up Your Profile


  • After confirming the User ID selection, the system will automatically direct you to the “gender settings.”
  • As pictured below, the icon Lazle-GBF-830M-Glass-Body-fat-Analyzer-User-Manual-fig-8 blinks, and you can cycle through and select from the options: female/male/female athlete/ male athlete using the “up” and “down” function keys.
  • Single-press “Set” to confirm your selection.


Athlete Mode:
An athlete is defined as a person involved in intense physical activity of approximately 12 hours per week and with a resting heart rate of approximately 60 beats per minute or less.


  • After confirming Gender, the system will automatically direct to the “height settings.”
  • As pictured below, the digit “165” blinks and you can then use the function keys “up” or “down” to increase or decrease the numeral according to your height.
  • Note: The Stature Setting ranges from 100 cm to 220 cm/3’3.5 ft to 7’2.5 ft. You may long-press on either of the function keys “up” or “down” to scroll rapidly through the numerals.
  • Single-press “Set” to confirm your selection.


  • After confirming Height, the system will automatically direct to the “age settings.”
  • As pictured below, the digit “30” blinks and you can then use the function keys “up” or “down” to increase or decrease the numeral to your age.
  • Note: The Age Setting for Normal Mode ranges from 10 to 85 years old.
  • The Age Setting for Athlete Mode ranges from 15 to 85 years old.
  • You may long-press on either of the function keys “up” or “down” to scroll rapidly through the numerals.
  • Single-press “Set” to confirm your selection.


Once all is complete, the display will show “0.0” before powering off. The user settings are now saved.


Repeat the procedure for a second user or to change user details. Note: To update or overwrite the set data, follow the same procedure, making changes as required.

For Weight-Only Measurement

To use the device as a conventional weight scale, no special programming is needed. Once the scale is initialized, simply position yourself appropriately on the scale to measure your current weight.



  1. The scale should be placed on a flat, hard surface. Soft, uneven, or carpeted floors may affect reading accuracy.
  2. Ensure you remain still while the scale computes your measurement.
  3. After the scale displays your weight value, it will automatically turn off in a few seconds.

For your First Measurement


  • Position the scale on a flat, hard surface and single-press the “Set” button to select your User ID.
  • Using the “up” or “down” button, cycle through and select the ID that identifies you.
  • Once the selected number is locked in, the screen will display “0.0”
  • Now, gently step on the scale with your bare feet, ensuring your feet are in good contact with the stainless steel pads (electrodes) on the platform.
  • Stand still and remain on the scale until the complete readout is displayed as indicated by full values instead of the moving “0” on the screen.
  • Your weight is displayed first, followed by body fat percentage, body water percentage, muscle mass percentage, bone density measurements, and personal parameters settings after 2-3 seconds.
  • You can now step off the scale. The measurement will remain displayed on the screen for 10 seconds, after which the device will power off. Start Measuring Note: If the device fails to complete the analysis, only the weight data will be displayed. (Kindly consult the Error and Troubleshooting section for solutions).

Start Measuring

  • Ensure the scale is on a hard, flat surface and has been initialized.
  • The GBF-830-M uses an original SENSE ON patent technology with automatic user technology, so simply step onto the platform in the correct positioning to take your measurement.
  • To obtain a complete, accurate measurement, keep your feet bare when you step on the platform. Body fat and total body water measurements require your feet to be without shoes or socks. Note: The condition of the bottom of your feet might affect the measurement. Readings are best taken with clean, slightly damp feet.
  • Stand still and remain on the platform until the complete readout is displayed (the unit stops displaying moving “0”).
  • According to the current readings, the system’s algorithm matches the data to the most similar User ID record.
  • If the system is unable to identify the User ID, the measurement data will be displayed for about 6 seconds before the device powers off automatically.
  • If the system can match the data with users with similar records, each User ID will blink in turn. Single-press the “Set” button to select the right user. The measured data will automatically be logged into the selected User ID and displayed on the screen.
Replacing The Batteries

When the “Lo” symbol appears, it is indicative of a low battery. The device will power off automatically after 4 seconds if the battery is drained. Kindly replace all four batteries at once, ensuring old batteries are not installed with new ones; and all batteries are of the same capacity. Worn batteries are hazardous waste.

Do NOT dispose of them with household garbage. Kindly refer to local ordinances and regulations on the disposal of worn batteries and scrap devices. If this device will not be inactive for a prolonged period, kindly take out the batteries before storing the scale in a cool, dry place.

Battery Replacement Procedure
  1. Open the battery compartment on the underside of the scale.
  2. Take out the old batteries and dispose of them appropriately.
  3. Correctly – in the right polarities, insert the new batteries (x4 AAA) into the battery compartment.
  4. The LED screen should light up once the new batteries are properly installed.
  5. Close the battery compartment and wait until the digits “0.0” are displayed on the LCD screen.

Body Fat Indicator
The Progress Bar on the LCD screen is also indicative of body fat level. After analysis, the varying length of the bar indicates different levels of body fat. (Kindly refer to “Table of Body Fat Level” for more details.)


Error Prompt 


Overload. The device will power off.


Do not use this scale for measurement.




Low Battery. The device will power off in four seconds.

Replace all four AAA batteries with new batteries of the same capacities.


Kindly purchase and make use of only manufacturer-authorized batteries for replacement.



FaultRoot CauseSolution


Abnormal measuring readings:

– Too high; OR

– Too low; OR

– Huge difference between two recent measurement.



Incorrect posture


Please position your bare feet on the stainless steel pads of the platform and remain still.

The device is on a soft or uneven surface, such as a carpet or rug. 

Kindly place the device on a flat, hard surface.


Your hands or feet are too dry.

Wipe your feet with a clean, damp cloth and ensure they are slightly wet before stepping on the scale.
The device fails to power on. 

Batteries are not installed,


Correctly – in the right polarities

– install the batteries.


Worn-out batteries


Replace all four AAA batteries with same-type batteries of the same capacity. Please use ONLY manufacturer-authorized batteries.





Fails to analyze body fat, total body water,

muscle mass and bone mass.


The user’s feet are not bare, as recommended.

Please ensure the user’s feet are bare and in full contact with the electrode pads during measurement.
The system is unable to match the data with a

possible User ID.

Please create and assign a User ID to the data. Check the section ”Setting Up your Profile.”

The user failed to select the User ID from matches

the system made.


Please assign a User ID to the data. Check the section ”Setting Up your Profile.”

The scale is damaged. 

Kindly purchase a new scale.


The device suddenly powers off.



Worn-out batteries.

Replace all four AAA batteries with the same-type batteries of the same capacity. Please use ONLY manufacturer-authorized batteries.



Product Name (GBF-830-M)



Scale: 330mmx320mmx19.4mm (Approx.)

Net WeightApproximately 1.87 kg (excluding the dry cells)
Display TypeDigital LCD with White Backlight
Measurement UnitKilogram / Pound / Stone
Measurement Range5kg to 180kg / 11lb to 397lb / 0st:11lb to 28st:5lb
Division0.1kg , 0.2lb , 0.2 lb/
Accuracy5-50kg: ±0.3kg; 50-100kg: ±0.4kg;

100-150kg: ±0.5kg; 150-180kg: ±0.7kg;

Optimal Operating ConditionsTemperature: 5℃ to 40℃ Humidity: 15% RH to 93%RH Atmospheric pressure: 70kPa to 106kPa
Optimal Storage ConditionsTemperature: -20℃ to 60℃  Atmospheric pressure: 50kPa to 106kPa
Power Requirements6V(4×1.5V AAA Batteries)
Power-On MethodSense-On Technology
Automatic Power DownAfter 10 seconds of inactivity
Accessories1. 6V(4×1.5V AAA Batteries)

2. User Manual

Mode of OperationContinuous Operation
Degree of protectionType BF applied part
Protection against ingress of waterIP21. This device is protected against solid foreign objects of 12.5mm and greater, and against vertically falling water drops.

Software Version




Always clean the device exterior with a soft, slightly damp cloth. To remove stains, use a mild soap. Wipe the device with a clean, dry cloth after wet cleaning. Always use a clean, dry, soft cloth to wipe off dust. Do NOT use detergents, propellants-treated clothes, harsh cleaning agents, or sprays on or in this device. Do not immerse or submerge this device or its parts in water or any liquid. us Kindly treat this scale with utmost care.

It contains sensitive electronic parts which should not be handled roughly. Do not jump on, drop suddenly, or kick the scale to avoid damaging its performance level. Not store the scale in the same room as cleaning chemicals or other household products that emit vapors that might affect the electronic components of the scale. Do NOT attempt to lubricate, disassemble, or open up this scale. This will void your warranty.

Kindly contact us for after-sales services. Always ensure measurements are taken on the same scale on the same surface. Otherwise, re-initialization will be needed. Measurements taken on a hard, even floor ensure optimal accuracy and consistency of results. We recommend taking measurements at the same time of the day, preferably early evening before a meal, for the best consistent results. This scale rounds up (or down) to the nearest two decimals.

If two values are obtained from two successive readings, your weight lies between the two. Do NOT dispose of batteries in a fire. Batteries may explode or leak. Always uninstall the batteries if the device will not be inactive for prolonged periods.

FCC Regulations

Note: 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, it is 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 to an outlet on a circuit different from that to which the receiver is connected,
  • Consult the dealer or an experienced radio l TV technician for help


About Muscle Mass
According to the American College of Sports Medicine (ACSM), lean muscle mass may decrease by nearly 50 percent between age 20 and 90. If you do nothing to maintain muscle mass, you might lose muscle and increase fat. It is also essential to know your muscle mass percentage during weight reduction. When at rest, the body burns approximately 110 additional calories for each kilo of muscle gained. The benefits of gaining muscle mass include:

  1. Reversing the decline in strength, bone density, and muscle mass associated with aging.
  2. Maintenance of flexible joints.
  3. Guided weight reduction when combined with a healthy diet.
MenApproximately 30% of total body weight
WomenApproximately 40% of total body weight

Regular exercise and a balanced diet can help maintain healthy bones. Like the muscle, the bone is a living tissue that can respond to exercise by becoming stronger. For most people, bone mass peaks in their thirties and then declines. Regular exercise can help prevent this. Calcium and vitamin D contribute to healthy bones. Some good sources of these nutrients are dairy products, green leafy vegetables, and fish. The bone mass readings given by this product are estimates of the amount of bone in your body. Kindly note; that those with osteoporosis or low bone densities may not get accurate estimations. If you have any concerns regarding your bones, please consult your doctor, as soon as possible.


Do not use this device within the vicinity of active HF-surgical equipment and the RF-shielded room of a ME system for magnetic resonance imaging, where the intensity of EM disturbances is high. Using this device adjacent to or stacked with other equipment is not recommended, as this could result in improper operation. If such use is necessary, check this device and the other equipment for proper operation.

The use of accessories, transducers, and cables other than those specified or provided by the manufacturer of this equipment could result in increased electromagnetic emissions or decreased electromagnetic immunity of this equipment and may result in improper operation. Portable RF-communications equipment (including peripherals such as antenna cables and external antennas) should be used no closer than 30 cm (12 inches) to any part of the equipment GBF-830-M, including cables specified by the manufacturer. Doing so may reduce the performance of this device.

TABLE 2: Guidance and manufacturer’s declaration on electromagnetic immunity TABLE 3: Guidance and manufacturer’s declaration on electromagnetic immunity
Guidance and manufacturer’s declaration  electromagnetic Immunity
Immunity TestIEC 60601-1-2

Test level

Compliance level
Electrostatic discharge (ESD)

IEC 61000-4-2

±8 kV contact

±2 kV, ±4 kV, ±8 kV, ±15 kV air

±8 kV contact

±2 kV, ±4 kV, ±8 kV, ±15 kV air

Electrical fast transient/burst

IEC 61000-4-4

Not applicableNot applicable

IEC 61000-4-5

Not applicableNot applicable
Voltage dips, short interruptions and voltage variations on power supply input lines

IEC 61000-4-11

Not applicableNot applicable
Power frequency magnetic


30 A/m


30 A/m


IEC 61000-4-8
Conducted RF


Not applicableNot applicable
Radiated RF IEC61000-4-310 V/m

80 MHz – 2,7 GHz

80 % AM at 1 kHz

10 V/m

80 MHz – 2,7 GHz

80 % AM at 1 kHz

NOTE: UT is the A.C. mains voltage before the application of the test level


TABLE 3: Guidance and manufacturer’s declaration on electromagnetic immunity
Guidance and manufacturer’s declaration  electromagnetic Immunity
Radiated RF IEC61000-4-3

(Test specifications for ENCLOSURE PORT IMMUNITY to

RF wireless communications equipment)

Test Frequency (MHz)Band








385380 –


TETRA 400Pulse modulation 18 Hz1,80.327
450430 –


GMRS 460,

FRS 460


± 5 kHz deviation 1 kHz sine

710704 –


LTE Band 13,


Pulse modulation 217 Hz0,20.39
810800 –


GSM 800/900, TETRA 800,

iDEN 820,

CDMA 850,

LTE Band 5

Pulse modulation 18 Hz20.328
17201 700 –

1 990

GSM 1800; CDMA 1900;

GSM 1900; DECT;

LTE Band 1, 3,

4, 25;


Pulse modulation 217 Hz20.328
24502 400 –

2 570

Bluetooth, WLAN, 802.11

b/g/n, RFID 2450,

LTE Band 7

Pulse modulation 217 Hz20.328


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