HF Scientific DRT-15A is a portable, battery-operated turbidimeter designed for field measurements of turbidity, which is the cloudiness or haziness of a fluid caused by suspended particles. The instrument has a wide measurement range of 0-1000 NTU (Nephelometric Turbidity Units), and it can be used to measure the turbidity of water, wastewater, and other fluids. The DRT-15A is a rugged and reliable instrument that is ideal for use in field applications, and it is easy to operate and maintain.