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The Hanna HI 9146 is a water-resistant, microprocessor-based, auto-calibrating Dissolved Oxygen meter with ATC. It has been developed for dissolved oxygen and temperature measurement in water and wastewater as well as other applications such as fish farming. Dissolved oxygen is indicated in hundredths of parts per million ( ppm= mg/ L) or in % of saturation . The temperature range is indicated in centigrade from 0 to 50 ° C with 0.1 ° C resolution. The ppm and the % saturation are both compensated for changes in solubility of oxygen in water and for permeability of the membrane as well as the temperature effect. â € ¢ Larger LCD â € ¢ Tutorial Messages Displayed â € ¢ Battery Messages Displayed â € ¢ Increased accuracy for temperature measurements â € ¢ 2 points calibration â € ¢ Auto-Endpoint Features â € ¢ D.O. Probe â € ¢ Rugged Case Range O2 0.00 to 45.00 mg/ L Range % Saturation O2 0.0 to 300.0% Range Temperature 0.0 to 50.0 ° C Resolution O2 0.01 mg/ L Resolution % Saturation O2 0.1% Resolution Temperature 0.1 ° C Accuracy O2  ± 1.5% F.S. Accuracy % Saturation O2  ± 1.5% F.S. Accuracy Temperature 0.5 ° C Calibration automatic, in air, at 100% Temperature Compensation automatic, 0 to 50 ° C ( 32 to 122 ° F) Altitude Compensation 0 to 1900 m ( 100 m 326' resolution) Salinity Compensation 0 to 40 g/ L ( 1g/ L resolution) Probe HI 76407/ 4F with 4 m cable Power Supply 4 x 1.5 AA batteries / approx. 200 hours of continuous use; auto-off after 4 hours of inactivity; or input for 12 Vdc power adapter Environment 0 to 50 ° C ( 32 to 122 ° F) ; RH max 100% Dimensions 196 x 80 x 60 mm ( 7.7 x 3.1 x 2.4" ) Weight 500 g ( 1.1 lb.) Range O2 0.00 to 45.00 mg/ L Range % Saturation O2 0.0 to 300.0% Range Temperature 0.0 to 50.0 ° C Resolution O2 0.01 mg/ L Resolution % Saturation O2 0.1% Resolution Temperature 0.1 ° C Accuracy O2  ± 1.5% F.S. Accuracy % Saturation O2  ± 1.5% F.S. Accuracy Temperature  ± 0.5 ° C Calibration automatic, in air, at 100% Temperature Compensation automatic, 0 to 50 ° C ( 32 to 122 ° F) Probe HI 76407/ 4F with 4 m cable Power Supply 4 x 1.5 AA batteries / approx. 200 hours of continuous use; auto-off after 4 hours of inactivity; or input for 12 Vdc power adapter Environment 0 to 50 ° C ( 32 to 122 ° F) ; RH max 100% Dimensions 196 x 80 x 60 mm ( 7.7 x 3.1 x 2.4" ) Weight 500 g ( 1.1 lb.)
