Turbidity Sensor Probe with amplifier circuit Module for Water Quality using Arduino or Raspberry PI , it has bot Analog and digital output, use as per convenience.

Turbidity is the measure of relative clarity of a liquid. It is an optical characteristic of water and is a measurement of the amount of light that is scattered by material in the water when a light is shined through the water sample. The higher the intensity of scattered light, the higher the turbidity.

High turbidity in drinking water can shield bacteria or other organisms so that chlorine cannot disinfect the water as effectively.

Some organisms found in water with high turbidity can cause symptoms such as nausea, cramps, and headaches.
 

Specification:
Type: Turbidity Value Detection Module
Working voltage: DC5V
Working current: 30mA (MAX)
Response time:<500ms
Insulation resistance: 100MΩ[Min]

Analog Output:
Analog output 0-4.5V

Digital Output:
High/low level signal
High level: 5V
Low level: 0V

Operating temperature: -30—80degC
Storage temperature: -10-80degC.
Size: 30mm*20mm*12mm