👉 An astigmometer is a device used to measure the size of an object, such as a candle or a ball. It consists of two lenses that are placed at different distances from the object being measured. The larger lens focuses light onto a screen, while the smaller lens reflects the light back into the eye of the observer. This allows the astigmometer to accurately measure the diameter of an object by focusing on one part of the object and measuring its distance from the other part.
