TURBIDITY METER HI 83414 is a highly accurate dual parameter instrument that reflects HANNA’ s years of experience. The HI 83414 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. The HI 83414 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 0.00 to 40.0 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. Features:  HI 83414 features four measuring ranges: ratio, non ratio, free chlorine, total chlorine Meets USEPA requirements Exclusive chlorine CAL CHECK™ calibration validation GLP Features Two, three, four or five point turbidity calibration USB PC connectivity Backlit LCD On-screen tutorial and help modes Log and recall up to 200 measurements Contextual help and tutorial mode Auto-off Specification: Range    Non Ratio Mode    0.00 to 9.99; 10.0 to 40.0 NTU; 0.0 to 99.9; 100 to 268 Nephelos 0.00 to 9.80 EBC Ratio Mode    0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU 0.0 to 99.9; 100 to 26800 Nephelos 0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC Free and Total Cl    0.00 to 5.00 mg/L (ppm) Resolution    Non Ratio Mode    0.01; 0.1 NTU; 0.1; 1 Nephelos; 0.01 EBC Ratio Mode    0.01; 0.1; 1 NTU; 0.1; 1 Nephelos; 0.01; 0.1, 1 EBC Free and Total Cl    0.01 mg/L (ppm) from 0.00 to 3.50 mg/L (ppm) 0.10 above 3.50 mg/L (ppm) Accuracy @25°C    Turbidity    ±2% of reading plus 0.02 NTU (0.15 Nephelos; 0.01 EBC) ±5% of reading above 1000 NTU (6700 Nephelos; 245 EBC) Free and Total Cl    ±0.03 mg/L or ±3% of reading (whichever is greater) Method    Turbidity    Nephelometric method (90°) or Ratio Nephelometric Method (90° & 180°), Adaptation of the USEPA Method 108.1 and Standard Method 2130 B Free and Total Cl    adaptation of the USEPA Method 330.5 and Standard Method 4500-Cl G. Light Detector    Turbidity    silicon photocell Free and Total Cl    silicon photocell with 525 nm narrow band interference filters Standards    Turbidity    <0.1, 15, 100, 750 and 2000 NTU Free and Total Cl    1.00 mg/L free/total chlorine Calibration    Turbidity    two, three, four or five-point calibration Free and Total Cl    one-point calibration Turbidity Range Selection         automatic Repeatability         ±1% of reading or 0.02 NTU (0.15 Nephelos; 0.01 EBC) whichever is greater Stray Light         < 0.02 NTU (0.15 Nephelos; 0.01 EBC) Measuring Mode         normal, average, continuous Light Source/Life         tungsten filament lamp / greater than 100,000 readings Display         40 x 70 mm graphic LCD (64 x 28 pixels) with backlight Log Memory         200 records PC Interface         USB Environment         0°C (32°F) to 50°C (122°F); max 95% RH non-condensing Power Supply         230 V/50 Hz or 115 V/60 Hz 20 W; auto-off after 15 minutes of non-use Dimensions         230 x 200 x 145 mm (9 x 7.9 x 5.7”) Weight         2.5 Kg (88 oz.)