Convex and concave lens

A balance bathroom scale, which is a regular bathroom scale that uses a balance mechanism, is primarily designed for personal use in households. Its main purpose is to measure a person's body weight accurately.

Bar and gauge apparatus is used to demonstrate thermal expansion and cooling contraction in classrooms and laboratories.

A glass beaker is a cylindrical, open-top container made of glass, typically with graduated volume markings on its side. It is commonly used in laboratories for holding, mixing, and heating liquids, as well as for performing various experiments and chemical reactions. Glass beakers come in various sizes and are designed to provide easy observation of the contents and to withstand temperature changes without significant deformation or chemical interaction with the substances being used.