Press READ Clause Samples
Press READ. The instrument will count from 60 to 0, measure the turbidity and store the value. The display will automatically increment to the next standard. Remove the sample cell from the compartment.
Press READ. The instrument will count from 60 to 0, read the blank and use it to calculate a correction factor for the 20 NTU standard measurement. The display will automatically increment to the next standard. Remove the sample cell from the cell compartment.