Why do multiple units of the Xiaomi Smart Temperature and Humidity Monitor 3 Mini show different readings during use?

Multiple units of the Xiaomi Smart Temperature and Humidity Monitor 3 Mini can display different readings due to various environmental and usage factors.
Common causes include:
  1. Environmental impact: Temperature and humidity readings can be affected by external factors. Ensure the ventilation holes are not blocked. If exposed to water, dry the device thoroughly. Human proximity, movement, breathing, or holding the device causes variations. Even in the same room, measurements can vary by location. This is normal;
  2. Testing conditions: For comparison, place all devices in a closed environment and leave them idle for approximately 30 minutes before checking readings. This reduces environmental interference, though minor discrepancies still occur. For precise measurements, lab-grade equipment is required;
  3. Accuracy range: The product has a humidity accuracy of ±5%RH (within 10–90%RH) and temperature accuracy of ±0.5°C;
  4. Sensor tolerance: In open environments, uneven distribution of temperature and humidity is common. A difference of up to 10%RH between two devices falls within the normal error margin—for example, one reading +5%RH and another -5%RH;
  5. Improper comparison: The monitor uses high-precision sensors. Do not compare readings with weather forecasts, humidifiers, air conditioners, or other brands of sensors—especially those using analog components, as their accuracy differs significantly.

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