The Hanna Turbidity Meter, Model 98703 is an easily used, hand-held meter for measuring turbidity. It is provide with 3 sample vials and 3 secondary calibration vials. The meter will measure from 0 to 1000 NTUs. The sample to be tested is placed in a vial and the vial is wiped clean and inserted into the meter. The cover MUST be closed and the "read" button pushed. The Results will be displayed on the LCD window.