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Flutter can be used to obtain sensor information from Wear OS wearable devices in the following steps:

1. Install and set up the Flutter environment on your development machine. This can be done by following the official Flutter documentation.

2. Install the ‘wearable’ package in your Flutter project. This package provides access to the Wear OS-specific APIs.

3. Use the ‘WearableSensors’ class from the wearable package to access the sensor data. This class provides methods for accessing data from various sensors like the Accelerometer, Gyroscope, and Heart Rate sensor.

4. Set up a listener for the sensor data using the ‘addListener’ method. This method takes a callback function that is called whenever new sensor data is available.

5. Retrieve the sensor data from the callback function and use it in your Flutter app.

Example code snippet for accessing accelerometer data:

import 'package:wearable/wearable.dart';

void main() {
  WearableSensors.accelerometer().addListener((AccelerometerEvent event) {
    print('x: ${event.x}, y: ${event.y}, z: ${event.z}');
  });
}

This code sets up a listener for the accelerometer data and prints the x, y, and z values whenever new data is available.