The document describes an economical turbidity meter model ACM-122-SC. It is a single element turbidity meter that uses light scattering techniques to measure turbidity in liquid samples. It has a wide measuring range of 5-400 NTU, uses an LED light source, displays readings on an LCD screen, and can operate for over 40 hours on a single battery. It is compact, lightweight, easy to use, and suitable for measuring turbidity in various types of water and other analytical applications.