How to independently check Xiaomi scales for accuracy: from calibration to error diagnosis

Xiaomi’s electronic scales are some of the most popular smart home gadgets, but even they can eventually start lying: 200-500 grams error on the Mi Smart Scale 2 or failures in body composition measurement on the Xiaomi Body Composition Scale are frequent complaints from users. The reasons range from discharged batteries to factory defects. In this article, we will discuss how to check the accuracy of Xiaomi’s scales at home without resorting to the services of a service center.

We tested all the methods on the Mi Scale models. 1/2, Xiaomi Smart Scale 2 Body Composition Scale 2, But most of the instructions will work for other smart scales in the brand, and it's important that the error is greater than that. ±1% from real weight, for example, 700 d at mass 70 The device needs repair or replacement. 80% This problem can be solved on your own – more on that.

Preparation of the scales for inspection: 5 mandatory steps

Before you test the accuracy, make sure the measurement conditions themselves do not distort the results, and even perfectly calibrated scales will show the wrong weight if you are standing on the carpet or near the source of vibration.

Here’s what you need to do before any checkup:

• 📍 Set the scales on a flat, hard surface, like tiles, laminate or countertops, avoid carpets, soft floors, and sloping floors, even a slight skew of 2-3.° It can give an error of up to 300 g.
• 🔋 Check the batteries - discharged batteries often cause unstable readings. On models with a display at low charge, the Lo indicator appears.
• 🧹 Clean the touch contacts - dirt or moisture on metal sites (especially on the Body Composition Scale) interfere with accurate measurement.
• 🌡️ Let the scales adjust to the temperature — if you bring them in from the cold (for example, after delivery in winter), wait 1-2 hours.
• 📱 Update the Mi app Fit/Zepp Life – Older software can mishandle weights, especially in models with body composition analysis.

Place it on a flat surface|Check the batteries (replace when used) <30% charge)|Clearing sensory contacts|Adapt to room temperature|Update the Mi app Fit/Zepp Life-->

If you're still lying after that, you go to the diagnostics, and start with the simplest test, which is zero.

Test for zero: rapid diagnosis of sensors

This method helps to identify mechanical problems – jammed sensors, damaged piezoelements or board malfunctions. Suitable for all Xiaomi models, including the Mi Scale and Body Composition Scale.

How to run the test:

1. Turn on the scales (click on the platform or install batteries).
2. Wait until 0.0 (or 00.0 for older models) appears on the display.
3. Carefully press the corner of the platform (not in the center!) with effort. ~50 A.D. Let go.
4. Repeat the press for all four corners.

🔍 What's going on:

• ✅ When pressed, the weight should react instantly (show 50–100 g) and just as quickly return to zero.
• ✅ All four corners shall have the same reaction (an error of not more than 20 g between the corners).
• ❌ If the scales show weight longer than 2 seconds after release or do not return to zero, the sensor is defective.
• ❌ If one of the corners reacts weaker than the others, the platform may be distorted or the sensor damaged.

If the zero test is successful, proceed to the accuracy check using reference loads.

Verification of accuracy with reference loads: step-by-step instruction

The most reliable way to estimate the error is to compare the readings of the scales with a known weight. M1 or M2 (You can buy homeware from the stores or order from AliExpress:

• 🍚 Package of rice/sugar (usually 1 kg with error) ±5g).
• 💧 Bottle of water - 1 litre = 1 kg (at 20 temperatures)°C).
• 📦 Dummies or sports pancakes (weight indicated on the body).
• 📖 Books - the average hardcover book weighs ~500g.

📌 How to run a test:

1. Place the reference load strictly in the center of the scale platform.
2. Record the readings (take a picture of the screen or write down the value).
3. Repeat the measurement 3 times with an interval of 10 seconds.
4. Calculate the average and compare it with the standard.

📊 Acceptable errors for Xiaomi weights:

⚠️ Note: If the error exceeds the specified values, the scales require calibration (about it in the next section), also check if the warranty period has expired: for most Xiaomi models, it is 12 months.

Mi Smart Scale 1|Mi Smart Scale 2|Body Composition Scale 2|Other models|Not using.-->

Xiaomi's Calibration Scales: When and How to Make It

Calibration is the setting of the weight sensors to standard conditions, and most Xiaomi models do it automatically when first turned on, but sometimes require manual adjustment, and signs that the weights need calibration:

• 📉 Indications “float” on repeated measurements (difference) >50g).
• 🔄 The scales show different weights when moving the load on the platform.
• ⚠️ The display displays an Err error or CAL.

🔧 How to Calibrate Xiaomi Libraries:

1. Make sure the scales are on a level surface (see Section 1).
2. Turn the scales on and wait for 0.0 to appear.
3. Press and hold the on button (or center of the platform) for 10-15 seconds until the display appears. CAL.
4. Wait until the scales show. --- or 0000 is a calibration mode.
5. Place a reference load (e.g. 10 kg) on the platform. PASS real weight.
6. Remove the load and wait for automatic exit from the calibration mode.

⚠️ Note: Not all Xiaomi models support manual calibration. For example, the Mi Smart Scale 2 only calibrates automatically when first turned on. If the error persists after calibration, try resetting (see Section 6).

💡

If your scales don’t have an on button (e.g., Body Composition Scale 2), quickly tap the platform 3 times in a row at 1 second intervals to enter calibration mode.

5. Checking body composition analysis: what could go wrong

Xiaomi Body Composition Scale models not only weigh but also analyze the percentage of fat, muscle, water and bone mass, and these data are calculated using the method of bioimpedansometry - the transmission of low current through the body, the error is higher than with conventional weighing, and depends on many factors:

• 💦 Hydration level – a dehydrated body will show an inflated percentage of fat.
• 🍽️ Time after eating/workout – measure body composition in the morning on an empty stomach.
• 🧴 Creams/Lotions on the legs – can distort the conductivity of the current.
• 🩴 Socks or shoes – measure barefoot, on clean dry feet.

🔍 How to check the accuracy of the analysis:

1. Make 3 measurements in a row at intervals of 1 minute. The range of values should not exceed: Weight: ±100 g fat: ±1% water: ±1.5% Muscle mass: ±0.5 kg

Tanita

age, height and sex

Mi Fit

❗ Critical errors in the analysis of body composition:

• 🚫 Err 1 – No contact with your feet (wipe your electrodes or moisten your feet).
• 🚫 Err 2 - too high/low resistance (check batteries).
• 🚫 Err 3 - unstable readings (repeat measurement).

💡

Xiaomi's weight analysis has a margin of error of up to 3-5 percent compared to professional equipment. It is acceptable to track the dynamics (weight loss/weight gain), but for medical purposes, the data is not suitable.

6. Resetting and flashing: extreme measures

If Xiaomi’s scales persist even after calibration, there are two radical methods: hard reset or firmware: the first will return the device to the factory settings, the second will update the software (relevant to models with Bluetooth 5.0 and later).

🔄 Hard discharge:

1. Remove the batteries from the scale.
2. Press and hold the on button (or center of the platform) for 30 seconds.
3. Put the batteries back in.
4. Turn on the scales – they should show 0.0 and be ready for the new setup in Mi Fit.

📲 Flashing (for advanced users):

This method is only suitable for support weights. OTA-Updates (e.g. Xiaomi Smart Scale 2 2022) will be required:

• Smartphone with Mi Fit/Zepp Life of the latest version.
• Stable Internet connection.
• Charged scales (batteries) >50%).

Instructions:

1. Open the Mi Fit app and go to the scales profile.
2. Click on three dots in the upper right corner → Settings of the device → Firmware update.
3. If a new version is available, click Update and wait until it is completed (don’t turn off Bluetooth!).

⚠️ Warning: Interrupting the flashing process can cause the scales to break. If the device does not turn on after the upgrade, try resetting (see above) or contact the service.

7.When Xiaomi scales are not repairable: signs of serious breakdown

Not all weight problems can be solved on your own, but here are the symptoms of critical malfunctions for which you should contact the service or consider buying a new weight:

• 🔌 Not included even after battery replacement (power charge may have burned).
• 📵 Not synced with the phone despite the fact that Bluetooth is working (problem with the communication module).
• 🔢 Show knowingly unreal weight (for example, 200 kg with a load of 10 kg) - damaged sensors.
• 💥 Cracks on the platform or body (especially dangerous for models with glass surfaces).
• 🔥 A foreign smell or heat is a sign of a short circuit.

💰 The cost of repairing the scales Xiaomi:

🔎 Where to fix it:

• 🛠️ Official service Xiaomi - warranty repair (list of centers on the site) mi.com/ru/service).
• 🔧 Local workshops are cheaper, but check reviews (look for Yandex.Maps or 2GIS).
• 📦 Self-replacement of spare parts – only if you have soldering experience (sensors and boards are sold on AliExpress).

FAQ: Frequent questions about Xiaomi weights check