A. 1. Calibrate the App: Check if the app has a calibration feature in the settings. Follow the instructions to calibrate it properly. 2. Ensure Proper Usage: Make sure you are using the app as intended. Refer to the user manual or help section for correct usage guidelines. 3. Compare with Other Tools: Use another reliable app or device to compare measurements and identify discrepancies.

B. 4. Update the App: Ensure you have the latest version of the app, as updates may fix measurement inaccuracies.