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A COD (Chemical Oxygen Demand) digester is a laboratory instrument used to determine the amount of oxygen required to oxidize organic and inorganic matter in a water sample. It's a crucial tool for assessing water quality, particularly in wastewater treatment and environmental monitoring, as it indicates the level of pollution. The digester provides controlled heating and digestion, allowing for accurate measurement of the COD value. 

A digital turbidity meter is a device that measures the clarity or cloudiness of a liquid sample by quantifying the amount of light scattered by suspended particles. These meters are crucial for assessing water quality, monitoring industrial processes, and in medical and research applications. They typically consist of a light source, a detector, and a sample chamber, and they operate based on the principle of nephelometry, which measures the intensity of scattered light. 

The TDS meter reading simply refers to the amount of total dissolved solids in your water, it will not tell you what those solids actually are and if they are harmful for your health. For example, you could have a high TDS meter reading but no harmful contaminants in your water