like pHotoFlex®, additionally: Turbidity measurement according to DIN 27027/ ISO 7027 0-1100 NTU/FNU Calibration kit (0.02-10-1000 NTU) The pHotoFlex® Turb is analogous to the pHotoFlex® pH, but includes an infrared (IR) light source for nephelometric turbidity measurement (90°), according to the requirements of DIN 27027/ISO 7027. Its precision is comparable to laboratory instruments for turbidity measurement. Together with the AMCO Clear® standards highest precision for the sensitive testing of drinking water is given. The calibration with the supplied AMCO Clear® standards and measured data can be documented and output via RS232.