Sensor Reporter (com.robotsidekick.SensorReporter) on Google Play
Simple app that outputs the raw sensor data for: - Accelerometer - Gravity - Gyroscope - Ambient Light - Linear Acceleration - Magnetic Field - Orientation (for Android 3.x and above, this does calculations based on Accelerometer and Magnetic Fileld sensors) - Pressure (Atmospheric) - Proximity - Relative Humidity - Rotation - Temperature