How Xiaomi Mi Body Composition Scale 2: Full Technology and Features

Smart scale Xiaomi Mi Body Composition Scale 2 has become one of the most popular gadgets for home health monitoring – they not only show weight, but also analyze body composition in 13 parameters. However, many users do not fully understand how these scales work, how accurate their readings are, and why the data may differ from medical devices. In this article, we will discuss in detail the operation of bioimpedance analysis technology (BIA), synchronization features with the Mi Fit application, as well as revealing the nuances that affect the accuracy of measurements.

If you're just planning to buy or you're already using the Mi Body Composition Scale 2, but you want to understand how it works at a deep level, this article is for you. We're not going to go into the superficial description, we're going to dive into the technical details, compare it with analogues and give practical recommendations for use, such as why scales can show different percentages of body fat in the morning and evening, how to interpret muscle mass and why the data sometimes differ from professional body composition analyzers.

Technology of bioimpedance analysis (BIA): How the scales "see" your body

Xiaomi Mi Body Composition Scale 2 is based on bioimpedance analysis (BIA — Bioelectrical Impedance Analysis: This method of measuring body composition is based on the fact that different tissues of the body (fat, muscle, bone, water) conduct electrical current in different ways. Libras pass through the body a weak alternating current (safe for a person) and measure the resistance (impedance) that it meets.

Here's how it works in practice:

• 🔋 Muscle tissue contains a lot of water and electrolytes, so conducts current well (low impedance).
• 🧈 Fatty tissue contains almost no water and conducts current poorly (high impedance).
• 🦴 Bones also have high resistance, but their influence is accounted for in weight algorithms.

The Mi Body Composition Scale 2 is equipped with four electrodes (two underfoot and two on a bare foot contact platform) that allow current to pass through the lower body. Based on the measured impedance and the data you input (gender, age, height), a special algorithm calculates:

• 📊 Percentage of body fat
• 💪 Muscle mass
• 💧 Water level
• 🦴 Bone mass
• ⚖️ Weight without fat (FFM — Fat-Free Mass)
• ⚡ Basic metabolism (BMR)
• 🏃‍♂️ Other indicators (13 in total)

It is important to understand that BIA — It's an indirect method of measuring. Libra doesn't "see" your fat or muscle directly, it calculates its proportion based on mathematical models.

Measurement Accuracy: Why Data May Be Different from Reality

Many users notice that the Mi Body Composition Scale 2 scores sometimes diverge from the results of professional body composition analyzers (for example, in fitness clubs or clinics).

The main factors affecting accuracy:

• 💧 Hydration level: If you drink a lot of water before weighing, the current resistance will decrease, and the scales can underestimate the percentage of fat.
• ⏰ Time of day: In the morning after sleep, the body’s water level is lower, so the percentage of fat is usually higher than in the evening.
• 🍽️ Eating: After eating, the content of water and electrolytes in the stomach increases, which distorts the readings.
• 🏋️ Physical activity: After exercise, muscles are saturated with blood, which reduces impedance and can overstate muscle mass.
• 🩴 Contact with electrodes: Dry or callosum feet impair current conduction, leading to errors.

For maximum accuracy, it is recommended to weigh at the same time of day (preferably on an empty stomach in the morning), without shoes and socks, on a dry and clean surface. It is also important that the legs are evenly located on the electrodes - do not lean on socks or heels.

⚠️ WARNING: If you use a pacemaker or other implanted electronic device, Mi Body Composition Scale 2 is contraindicated! weak current passing through the body can disrupt the operation of the medical device.

The critical feature of the Mi Body Composition Scale 2: scales do not take into account the distribution of body fat (visceral / subcutaneous), but only show the total percentage. To assess the risks of metabolic diseases (for example, diabetes), this is not enough - professional methods such as DEHA or MRI are required.

Synchronization with Mi Fit: how scales transmit data and what to do when crashes

Xiaomi Mi Body Composition Scale 2 is paired with Mi Fit (or Zepp Life in new versions), where all the measured parameters are transmitted (BLE), It's a low-power, stable connection, but sometimes users have connectivity issues, and we'll look at how it works and how it's fixed.

Data transfer process:

1. Libras are turned on when stepping on them (automatically or by pressing a button).
2. The electrodes are being used to send current, and the sensors are recording impedance.
3. The microprocessor of the scale calculates the parameters of the body composition.
4. Data is sent to the smartphone by BLE.
5. The Mi Fit app saves results and builds dynamic graphs.

If the scales are not synchronized, check the following:

Is Bluetooth on your smartphone |

Is the Mi Fit app updated to the latest version?|

Notifications and location access for Mi Fit|

Is the number of connected devices exceeded (maximum 8)|

Reload the scales (hold the 5 seconds button)-->

One of the common bugs is that the scales show the weight on the screen, but the data is not sent to the app.

• 📱 Conflict with other devices: If other Xiaomi gadgets (such as a bracelet) are connected to the phone, try to turn them off temporarily.
• 🔄 Bluetooth cache failure: In your smartphone settings, find Settings → Annexes → Mi Fit → Memory. → Clear the cache.
• 🔋 Batteries discharged: Despite 12 months of claimed lifespan, weak batteries can cause transmission failures.

⚠️ Warning: If you reset the scales to factory settings (holding the 10 seconds button), all stored data (up to 16 dimensions) will be deleted! Mi Fit app stores history independently, but last unsynchronized weighings will be lost.

For stable operation it is recommended:

• 📲 Use a smartphone on Android 6.0+ or iOS 10.0+.
• 🔄 Regularly update the firmware of the scales through Mi Fit (section Profile) → My devices. → Mi Body Composition Scale 2 → Update of the PO).
• 📡 Make sure the distance between the phone and the weight is not greater than 10 metres (ideally — 1-2 square).

Comparison with other smart scales: how Mi Body 2 is better (or worse) than competitors

In the smart scale market, the Xiaomi Mi Body Composition Scale 2 competes with models from Withings, Garmin, Fitbit and other brands. Let’s compare them on key parameters to understand the strengths and weaknesses of the Xiaomi device.

The main advantages of Mi Body Composition Scale 2:

• 💰 Price/quality ratio: B 2-3 less expensive than analogues with comparable functionality.
• 📱 Integration with Xiaomi ecosystem: Data automatically synced with Mi Band, Mi Watch and other devices.
• 🔋 Long battery life: With daily use, it lasts a year or more.

Disadvantages that are worth knowing:

• 📉 Limited accuracy BIA: Like all scales with bioimpedance analysis, Mi Body 2 fall short 3-5% Fat measurement compared to professional methods (DEXA, hydrostatic weighing).
• 🚫 No hand electrodes: Libras only analyze the lower body, whereas pen models (like Tanita) give a more complete picture.
• 🌍 Regional restrictions: In some countries (e.g. the U.S.), scales are sold under the Zepp brand with other software.

💡

If you want to be as accurate as possible in your muscle mass measurements, combine weights with smart bracelets (such as the Xiaomi Smart Band 8) that track activity and calories, which helps you adjust body composition analysis algorithms.

Advanced Functions: What Scales Can Do Beyond Basic Analysis

In addition to standard weight and fat percentage measurements, the Xiaomi Mi Body Composition Scale 2 offers several useful features that many users are unaware of.

1. Guest mode

If several profiles are connected to the scales, they automatically recognize the user by weight (with an error). ±2 kg. But what if you weigh a person whose profile is not saved:

1. Step on the scale and hold the button for 3 seconds.
2. There's a sign on the screen. GUEST.
3. After weighing, the data will not be stored in history, but will be shown on the display.

Measurement in kilograms, pounds or jin

The scale supports three units of weight measurement:

• ⚖️ Kilograms (kg) - Standard mode.
• 🏋️ Pounds (lb) – for countries where the imperial system is used (USA, UK).
• 🇨🇳 Jin - Chinese unit (1 Jin) = 0.5 kg).

To change the unit, press the button on the scale for 5 seconds until the indicator blinks. Then briefly press the button to switch between modes.

3. Bone mass and knaser fat analysis

Two of the most underrated scores in Mi Body Composition Scale 2:

• 🦴 Bone mass: Shows the weight of your bones, low may indicate a risk of osteoporosis, and high may indicate excessive exercise (for example, weightlifters).
• 🩺 Visceral fat: This is the fat surrounding the internal organs. Its high levels (over 10) are associated with the risk of diabetes and cardiovascular disease. Xiaomi scales it on a scale from 1 to 59.

4.Sync with Google Fit and Apple Health

If you use other fitness apps, data from the Mi Body Composition Scale 2 can be automatically exported to:

• 📲 In Mi Fit go to Profile → Settings → Accounts and synchronization.
• 🔗 Connect to Google Fit or Apple Health.
• 🔄 Choose which parameters to sync (weight, percentage of fat, etc.).

Common User Mistakes and How to Avoid Them

Even experienced smart scale owners sometimes make mistakes that distort the results, and here are the most common ones and ways to avoid them.

1. Weighing on carpet or soft coating

The Mi Body Composition Scale 2 scales must stand on a flat, hard surface (tile, laminate, wood) and if they are on the carpet, this leads to:

• 📉 Incorrect weight measurement (accuracy to the 200-300 s).
• ⚡ Violation of contact of electrodes with legs, which distorts bioimpedance analysis.

Solution: Use scales on the bare floor or put a thin, hard stand under them.

Weighing in clothing or shoes

Even lightweight clothing (socks, T-shirts) can add to the list. 100-300 d to the real weight, and shoes - up to 500 In addition, the tissue impairs the contact of the electrodes with the skin, which affects the accuracy of the electrodes. BIA. The best option is to weigh yourself fully naked or in a minimum amount of light clothing (for example, in underwear).

Ignoring calibration

The Mi Body Composition Scale 2 does not require manual calibration, but sometimes its readings can "float" due to mechanical impacts (falls, transports).

1. Remove the batteries for 10 minutes.
2. Put the scales on a flat surface and press on all four corners of the platform (this resets the internal sensors).
3. Insert the batteries back and perform a test weigh with a known load (e.g. a bottle of water). 1-2 kilogram).

4.Use of scales after shower or pool

Wet skin significantly reduces impedance, which can cause the scales to show an understated percentage of fat and overstated muscle mass. 15-20 minutes to allow the skin to dry naturally.

💡

The most accurate results of the Mi Body Composition Scale 2 are shown by observing the “three P rule”: Empty bladder, Empty stomach (on an empty stomach), Constant weighing time (for example, every morning after waking up).

Update firmware and hidden opportunities

Many users are unaware that the Xiaomi Mi Body Composition Scale 2 can be upgraded like a smartphone.

• 🔄 Stability of Bluetooth communication.
• 📊 Accuracy of algorithms for analysis of body composition.
• 🆕 Adding new features (e.g. supporting additional units of measurement).

To update the firmware:

1. Open the Mi Fit app and go to Profile → My devices. → Mi Body Composition Scale 2.
2. Click on the three dots in the top right corner and select Software Update.
3. If a new version is available, follow the instructions on the screen. Do not take weight off the scale during the update!

Hidden features that appear after updates:

• 👶 Child Mode: Some firmware versions have added the ability to measure the weight of children from 5 years old (adjusted for height).
• 📈 Trend charts: Mi Fit app offers the ability to compare week-month dynamics.
• 🔋 Energy optimization: New firmware reduces battery consumption with frequent weighings.

⚠️ Attention: If the scales go off during the firmware update (e.g., the batteries go down), they may stop turning on. In this case, try: Replace the batteries with new ones. Hold the button 10 Repeat the update procedure. If the scales have not recovered, contact Xiaomi Support with the model (XMTZC05HM For the Mi Body Composition Scale 2). FAQ: Reply to Frequent Questions ❓ Why do scales show different weights when weighed again: 🔄 Mechanical error of sensors (tolerance) ±50 s). 🧘 Position on the scales (if you stand closer to one of the edges, the readings may differ). 🌡️ Ambient temperature (at low temperature, metal sensors compress, which affects accuracy).Solution: Weigh down. 2-3 Take the average, and also check if the scales are even on the floor. ❓ Can I use a scale with an iPhone? Yes, Mi Body Composition Scale 2 is fully compatible with iPhone (requires iOS 10.0 or later). To connect: Download the Mi Fit app from the App Store. Sign up or sign in to Xiaomi account. In Devices, select Add Device → Libra → Mi Body Composition Scale 2. note: On iPhone, sync may run slower than on Android due to iOS limitations on Bluetooth background work. ❓ How do you change the units from kg to pounds? To switch the units: Step on the scale and wait for the weight to appear on the screen. Hold the button on the scales for 5 seconds until the indicator flashes. Press the button briefly to switch between kg, lb and. Wait 3 seconds, the selected unit will be saved, and you can change the units in the Mi Fit application in the device settings. ❓ Why the scales show a "Lo" or "Err" error"? Mi Body Composition Scale 2 Errors Mean Lo - Batteries are discharged (replace all 4 elements) AAA). Err 1 is overload (maximum weight 150 kg). Err 2 is unstable surface or vibration. Err 3 is sensor failure (try to lose weights to factory settings). If the error repeats after replacing batteries, check the contacts in the battery compartment for oxidation. ❓ Can you use a scale without a smartphone? Yes, the Mi Body Composition Scale 2 is autonomous and shows the weight and percentage of fat on its screen even without a phone connection: 📱 Without a smartphone, you won’t see a complete analysis of body composition (muscle mass, water, bones, etc.). 📊 The data will not be stored in history (the scales only store the last dimension). 🔄 You can't update your firmware or change your settings. You have to make a smartphone to use the scales.