Xiaomi Smart Libra: How to Set Up, Use and Analyze Data

Xiaomi’s smart scales have long since ceased to be just a weight measurement device, becoming a full-fledged health assistant. With models like the Mi Body Composition Scale 2 or Xiaomi Smart Scale 2, you get not only accurate body weight readings, but also detailed body composition analysis: fat percentage, muscle mass, water level and even bone density. However, many users have difficulty connecting or interpreting data for the first time.

In this article, we will break down the step-by-step adjustment of scales, explain how to properly sync them with the Mi Fit app (or Zepp Life for new models), decipher all the indicators and give tips for correcting typical errors, and pay special attention to the nuances that the manufacturer often misses in official instructions - for example, why the scales can show different data in the morning and evening or how to calibrate the device for maximum accuracy.

What models of smart scales Xiaomi produces and how they differ

Xiaomi offers several smart scales, each designed for different tasks, with the main differences in sensor accuracy, metrics and design supported, and the key models for 2026:

• 🔹 Mi Body Composition Scale 2 — most popular model with analysis 13 body parameters (including visceral fat and metabolic age) Supports Bluetooth connectivity 5.0 and compatible with Mi Fit/Zepp Life.
• 🔹 Xiaomi Smart Scale 2 - budget option with basic metrics (weight, BMI, fat / muscle mass.
• 🔹 Xiaomi Mi Scale 3 - model with improved accuracy (accuracy up to 50 g) and the function of measuring heart rate through the legs.
• 🔹 Xiaomi Body Fat Scale (for children) - a specialized version with adapted algorithms for users from 5 years old.

Xiaomi scales work on the principle of bioimpedance analysis: through the legs, a weak electric current is passed that interacts with the tissues of the body, which is why it is important to stand on the scales with bare feet, with uniformly distributed weight and on a dry surface for accurate readings.

When choosing a model, pay attention to the maximum supported weight - most Xiaomi scales have 150 kg, but there are exceptions (for example, Xiaomi Mi Smart Scale Lite is limited to 100 kg).+ or iOS 10.0+.

Preparation for the first use: unpacking and installation of the application

Before the first weighing, you need to properly prepare the scales and install the associated software. Start by unpacking the device: in the box you will find the scales themselves, 4 batteries AAA (sometimes already installed and brief instructions in several languages (unfortunately, often without Russian).

Important point: if the batteries are not installed, do it strictly polarity (plus to plus, minus to minus). Installation can cause sensors to fail. Once the batteries are installed, the scales must automatically turn on, as indicated by the flashing of the indicator on the display.

Download the official appendix:

• 📱 For most models - Mi Fit (App Store / Google Play).
• 📱 For the New Weights (2023–2026) – Zepp Life (formerly Mi Fit with an updated interface).

⚠️ Note: If you have previously used Huawei or Honor scales, uninstall the Huawei Health app before installing Mi Fit.

After installation of the annex:

1. Sign up or sign in via your Xiaomi account (you can use Google or Apple ID).
2. In the Profile section → Devices → Add the device select your model of weights.
3. Follow the instructions on the screen for pairing over Bluetooth.

Install batteries (if not installed)|Download Mi Fit/Zepp Life|Register in the annex|Synchronize the scales over Bluetooth|Put the scales on a flat, hard surface-->

How to weigh correctly: step-by-step instructions

The accuracy of Xiaomi's smart scales depends not only on the calibration of the device, but also on how you make the measurements.

1. Time of day: It is better to weigh yourself in the morning on an empty stomach, after going to the toilet. In the evening, the readings can vary by 0.5-1.5 kg due to the fluids and food consumed.
2. Surface: Put the scales on a flat floor (tile, laminate, wood) carpet or soft coating will distort the results.
3. Pose: Stand on the scales with bare feet, spreading the weight evenly. Don't lean on the wall or furniture.
4. Stability: Stand still for 3-5 seconds until a stable value appears on the display.

After a successful weighing, the data is automatically synchronized with the application.

• 🔄 Check if Bluetooth is on on your smartphone.
• 🔄 Make sure that the scales and phone are no more than 5 meters away.
• 🔄 Re-launch the Mi Fit app.

⚠️ Note: If the scales show a Lo error (low battery charge), replace all 4 elements AAA Using old and new batteries together can cause failures.

For maximum accuracy, measure at the same time of day and in the same clothes (or without), Xiaomi algorithms take into account previous data, so regularity is more important than one-time measurements.

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If the scales show an unrealistically low percentage of fat (e.g., 5-8%), check if your height and age are correctly listed in the Mi Fit profile.

Decoding indicators: what all the numbers in the appendix mean

Mi Fit is a tool that displays up to 13 parameters, but not everyone understands what they mean.

• 📊 Weight is the baseline in kilograms. Accuracy depends on the calibration of the scales.
• 📊 BMI (By mass index) - weight to height ratio: Normal: 18.5-24.9. Limitation: does not take into account muscle mass.
• 📊 Fat percentage is fat tissue ratio, males 10-20%, females 20-30%.
• 📊 Muscle mass is the weight of muscles in kg. Important for athletes.
• 📊 Visceral fat is fat around the internal organs. Normal: 1-12. Dangerous if above 15.
• 📊 Water level is the percentage of fluids in the body. Normal: 45-65%. Below 45% is a sign of dehydration.
• 📊 Bone mass is bone weight. Mean: 2-3 kg for women, 3-4 kg for men.
• 📊 Metabolic age -- comparing your metabolism to your average age group, and if you're above your real age, it's time to get healthy.

It's important to understand that bioimpedance analysis is an indirect method of measurement, and its accuracy depends on many factors:

• 🔹 Hydration level (after a workout or sauna, data will be distorted).
• 🔹 Eating (after eating fat mass may seem higher).
• 🔹 Menstrual cycle phases in women (fluid retention distorts results).

If your readings seem unrealistic (e.g., 5% fat percentage at 80 kg weight), check:

1. Is the height, age and gender in the profile correct?
2. Whether you are standing on a scale in socks or on a carpet.
3. Are the batteries discharged (at low charge, the sensors work incorrectly).

Sync with other services: Apple Health, Google Fit, Strava

One of the key benefits of Xiaomi’s smart scales is the ability to integrate with popular fitness platforms, which allows you to collect all your health data in one place.

With Apple Health (for iPhone):

1. Open Mi Fit → Profile → Settings → Data Synchronization.
2. Select Apple Health and allow access.
3. Specify what data to transmit (weight, percentage of fat, etc.).

With Google Fit (for Android):

1. In Mi Fit go to Profile → Synchronization → Google Fit.
2. Sign in through your Google account.
3. Select the sync direction (from Mi Fit to Google Fit or vice versa).

Syncing with Strava or MyFitnessPal will require an intermediate application like SyncSolver or Health Sync (available on Google Play and the App Store), which are paid but offer a trial period.

⚠️ Note: When synchronized with Apple Health, body composition data (fat, muscle) may not be transmitted due to Apple restrictions. CSV via Mi Fit.

If the synchronization is not working:

• 🔄 Reinstall the Mi Fit app.
• 🔄 Check whether the data transfer does not block the power saving mode on the smartphone.
• 🔄 Update the firmware of the scales (instructions in the next section).

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For accurate tracking of progress, use one application as your primary (e.g. Mi Fit) and synchronize only key metrics (weight, BMI) with other services.

Update firmware and reset settings

Like any smart device, Xiaomi scales receive periodic firmware updates that fix sensor errors, add new metrics, or improve communication stability.

1. Open Mi Fit and go to the Profile section → Your devices.
2. Select your scales and find the Firmware Update item.
3. If a new version is available, connect the scales to the charger (via Micro-USB or wireless charging, depending on the model) and run the update.

Important: Don't interrupt the update process! This can lead to loss of sensor calibration. If the scales "hang" during the upgrade phase:

• 🔄 Wait 10-15 minutes.
• 🔄 Reset the scales by taking out and inserting batteries.
• 🔄 Repeat the update procedure.

If the scales start showing incorrect data or are not synchronized, reset the settings:

1. Call the menu on the scales, holding the switch on 5-7 seconds (on some models you need to press the display and hold).
2. From the menu, select Reset or Reset (use the buttons on the scales to navigate).
3. After reset, re-synchronize the scales with the application.

⚠️ Attention: Resetting removes all saved user profiles. If you have multiple users using scales, everyone will have to re-link their Mi Fit account after resetting.

For Wi-Fi models (such as Xiaomi Mi Smart Scale 2), firmware updates can occur automatically when connected to the network. Make sure the scales are connected to 2.4 GHz Wi-Fi (they don't support 5 GHz).

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If the scales stopped turning on after the upgrade, try replacing the batteries with new ones (even if the old ones seemed to work), often because of insufficient voltage.

Typical errors and their elimination

Even Xiaomi models that have been tested sometimes fail, and here are the most common mistakes and ways to fix them:

If the scales show an Err 2 or Err 3 error, it indicates a sensor problem.

• 🔧 Reset the scales (remove the batteries for 1 minute).
• 🔧 Wipe contacts with batteries of alcohol.
• 🔧 Update the firmware through Mi Fit.

Err 5 (less common) requires sensor calibration, which can be done at a service center or by yourself:

1. Put the scales on a flat surface.
2. Hold the power button for 15 seconds until it appears. CAL.
3. Wait 2-3 minutes (the scales will be calibrated automatically).

If none of the methods worked, please contact Xiaomi via the Mi Fit app (Feedback section) or the official website.

• 📌 Model of weights.
• 📌 The firmware version (you can find it in Mi Fit).
• 📌 Description of the error with the photo (if any).

FAQ: Answers to Frequent Questions