An inclinometer is a device that measures the angle of inclination or tilt of an object. It is also known as a tilt sensor or tilt meter. There are various types of inclinometers, including mechanical, electro-mechanical, and electronic. Mechanical inclinometers use a pendulum or a weight to measure the angle of tilt, while electro-mechanical inclinometers use a strain gauge or a capacitive sensor to measure the angle. Electronic inclinometers use sensors such as accelerometers or gyroscopes to measure the angle. Inclinometers are commonly used in applications such as construction, surveying, and automotive engineering to measure the angle of incline or slope of a surface. They are also used in military and aviation for guidance and navigation.