Turbidities in the range of FNU (NTU) 0.0001-1,000 are measured and displayed alphanumerically using a controller. This high resolution facilitates precision differentiation, even for ultra clear liquids. A pulsed, long-life IR radiation source (LED) ensures that costs are minimized. Designed in accordance with DIN EN ISO 7027 and permanently calibrated before leaving the factory. All key data is set to practical standard values.