How does the instrument the tilimeter works?

A tilimeter, also known as a tilt meter, measures the tilt or inclination of a surface relative to the horizontal plane. It typically consists of a sealed, liquid-filled tube with a bubble or an electronic sensor that detects changes in tilt. As the surface tilts, the liquid shifts, moving the bubble or changing the sensor's output, which is then converted into a measurable angle. This instrument is commonly used in civil engineering and geotechnical monitoring to assess the stability of structures and landslides.