It is a highly accurate dual parameter instrument that reflects Hanna’s years of experience. It successfully combines turbidity and colorimetric measurements to test the most important parameters of drinking water: turbidity and free/total chlorine. The meter is specially designed for water quality measurements, providing reliable and accurate readings on low turbidity and chlorine values. Model meets and exceeds the requirements of USEPA and Standard Methods both for turbidity and colorimetric measurements. With the powerful Cal Check function, reliable performance can be validated at any moment by using the exclusive Hanna ready-made, NIST traceable standards. A one-point calibration can be performed using the same Cal Check standard. This instrument features an optical system to guarantee accurate results, assure long term stability and minimize stray light and color interferences. They also compensate for variations in intensity of the lamp for less frequent calibration. The 525 nm interference filter of the colorimeter assures accurate and repeatable results. Repeatability of the measurements are ensured with 25 mm round cuvettes made from special optical glass. Turbidity measurements can be made in the 0.00 to 4000 NTU (Nephelometric Turbidity Units) range when ratiometric measurements are used and in the 0 to 40 NTU range when non ratio method is used. The HI 83414 has an EPA compliance reading mode which rounds the reading to meet EPA reporting requirements. Alternative EBC and Nephelos measuring units are available. Depending on the measured sample and needed accuracy, normal measurement, continuous measurement or signal averaging measurement can be selected. A two, three, four or five-point calibration can be performed by using the supplied (<0.1, 15, 100, 750 and 2000 NTU) standards. If user prepared standards are used, the calibration points can be modified. Free or total chlorine measurements can be made in the 0 to 5 milligrams per liter (ppm) range.