Aqua Lab Pawkit Quick Start Manual page 4

Verification vs.
Calibration
Verification
Your instrument needs to be verified with a primary
and a secondary verification standard every day.
Standards are salt solutions with known water
activities. Measuring one standard at the bottom
of a water activity range and one towards the top
of the range will alert the operator to shifts in the
calibration.
Calibration
If a shift occurs and you notice that the standard
isn't measuring in spec, the first thing you need
to do is clean the instrument. If the standard is
still not measuring in spec after cleaning you can
adjust the calibration up or down using the .920,
3
.760, or the .250 standard.
*Standards come in boxes of 50 plastic disposable vials and the
four types you can use with the Pawkit for verification include the
.920,.760, and the .250.
*Note: Adjusting the calibration of the instrument should only be
done when the verification standards are reading out of spec.
If you need help determining which standards
to use to verify your instrument or you can't
get you instrument to measure within spec
of the standards, please contact AquaLab
Customer Support support@aqualab.com or
509-332-5601.