Clarity II turbidity meters used to measure turbidity. Low level of ambient light, high stability, efficient removal of bubbles and high resolution makes 0,001 NTU turbidity Clarity II ideal instrument for monitoring the turbidity of filtered drinking water. Since the instrument measures the turbidity of 200 NTU, it is also suitable for various kinds of raw water. Clarity II turbidity meters can be used in applications other than drinking water purification. Examples are the monitoring of waste water and condensate return of clarifiers. Compatible sensors can be used USEPA 180.1 and ISO 7027. USEPA 180.1 Sensors use visible light source. Sensors ISO 7027 using a light emitting diode (LED) near-infrared.