Sonometer NV6052 is a useful apparatus for investigating the vibration of a string or wire under tension. The equipment allows the length of the string and its tension to be varied. Sonometer can determine the Frequency of A.C. mains in an easy way with very precise and fine arrangement. It consists of a thin metallic (steel) wire stretched over two bridges that are usually mounted on a soundboard, also known as monochord. It is used to measure the vibration frequency, tension, density, or diameter of the wire, or to verify relations between these quantities.