The HI96729 meter measures the fluoride content in the 0.00 - 2.00 milligrams per liter (ppm) range, in drinking, surface and waste waters. The amount of reagent is precisely dosed by use of the supplied automatic pipette for maximum repeatability. 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. HI96729 is supplied 2 sample cuvettes with caps, 9V battery and instruction manual. 0.01 milligrams per liter (ppm) pH resolution. +/-0.03 milligrams per liter +/-3 percent of reading at 25 degree C accuracy. Tungsten lamp. Silicon photocell with narrow band interference filter at 575nm light detector. 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. Adaptation of the EPA method 340.1 and standard methods for the examination of water and wastewater, 20th edition, SPADNS method.