LaMotte SMART 2 Electronic Soil Lab - Manual (Page 13)

reagent blank using a pH meter. This is the ideal pH for the test. Measure the
pH of a reacted soil extract using the pH meter. If the pH is significantly
different from the ideal value, the pH of the sample should be adjusted before
testing.
Interferences due to high concentration of the substance being tested, can be
overcome by sample dilution (see page 11).
n
CALIBRATION
As with all pre-calibrated meters, it is highly recommended, even if not
required by regulations, that the user periodically verify the performance of the
meter by running standards with a predetermined concentration. Results
outside of specification are an indication that the meter needs to be adjusted.
This can be done following the user calibration described on page 34. If the
user calibration fails to properly adjust the meter then the meter should be
returned to LaMotte Company for recalibration. (See page 5).
SMART2 SOIL MANUAL 1.07 13