Type of instrument used for integrating instrument?

A planimeter is an instrument used for determining the area of an irregular two-dimensional shape. It works by tracing the perimeter of the shape with a stylus while a mechanism inside the instrument measures the distance traveled and multiplies it by a scale factor to give the area. Planimeters come in various types, including polar planimeters, radial planimeters, and digital planimeters. They are widely used in fields such as cartography, engineering, architecture, and agriculture.