Hanna Instruments HI96735 EPA Total Hardness Portable Photometer with Sample Cuvettes, 7-19/32" Length x 4-3/32" Width x 2-11/16" Height, 400 - 750mg/L, 5.0mg/L Resolution, 9V Battery

Total hardness, that is the presence of magnesium and calcium, is due mainly to the runoff water dissolving these salts as it flows or filters through different strata. Hardness can also cause scaling of pipes in cooling and heating systems. The HI93735 measures the total hardness in drinking, surface and wastewater. This meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. It is designed to fit cuvettes with a larger neck making it easier to add both sample and reagents. The cuvettes are made from special optical glass to obtain best results. HI96735 is supplied with 2 sample cuvettes with caps, 9V battery and instruction manual. LR 0 - 250 milligrams per liter; MR 200 to 500 milligrams per liter; HR 400 to 750 milligrams per liter range. 1.0 milligrams per liter from 1 to 100 milligrams per liter; 5.0 milligrams per liter from 100 to 750 milligrams per liter resolution. LR +/-5 milligrams per liter +/-4 percent of reading at 25 degree C; MR +/-7 milligrams per liter +/-3 percent of reading at 25 degree C; HR +/-10 milligrams per liter +/-2 percent of reading at 25 degree C accuracy. Light emitting diode. Silicon photocell with narrow band interference filter at 466nm light detector. Adaptation of the EPA recommended method 130.1. 0 to 50 degree C (32 to 122 degree F); RH maximum 95 percent non-condensing environment. Auto-shut off: after ten minutes of non-use in measurement mode, after one hour of non-use in calibration mode with last reading reminder. Measures 7.6" length by 4.1" width by 2.7" height.