Instruction Manual pH 5+, pH 6+, Ion 6+-10-available include 0.1, 1.0, 10.0, 100.0 ppm. Recalibrate and ensure that consecutivecalibration points are 1 decade apart from each other.Ensure that you use new or fresh standard solutions during calibration. Do not reuse ionstandard solution as it may be contaminated and affect the calibration and accuracy ofmeasurements. Store standard solutions in a dry, cool environment if possible. Checkthat ISE’s and ion standard solutions are kept in good condition for best results.Before use, remove any plastic protective cap of ISE (at the tip of sensor) and refer toelectrode instruction manual for proper operation. Rinse probes before and after eachcalibration or sample measurement to avoid cross-contamination.3.2.1 Ion Calibration ProcedureThe Ion 6+ can measure various ions. Ion measurement requires ion selectiveelectrodes (ISE)—(sold separately) which measure a specific ion of interest—such asammonia or fluoride.The available ion calibration values for the Ion 6+ are 0.1, 1.0, 10.0, and 100.0 ppm.Pick any 2 or 3 consecutive values to use and prepare the corresponding ion calibrationsolutions. Turn on the meter and select ion mode by pressing MODE key if necessary.For best results, always begin with your lowest standard value, followed by thenext lowest standard.1. Dip the ISE into your standard solution. Add ISA if required. Swirl it gently. PressCAL key to begin calibration mode.2. The display shows “CA” (to indicate calibration mode) momentarily followed by “0.1”flashing. To select the appropriate standard, use S and T keys.