pH-D tester

OPERATION

Remove the protective cap. Do not be alarmed if white crystals appear around the cap. This is normal with ph electrodes and they dissolve when rinsed with water.

Turn the tester ON by pressing the ON/OFF button.

Immerse into solution up to the maximum immersion level.

Stir gently and wait until the display stabilizes

After use, turn the tester off by pressing the ON/OFF button, use the water clean the electrode and replace the protective cap.

Do not use distilled or deionized water for storage purposes.

Large fluctuations in readings could be due to lack of calibration, dry electrode or rundown batteries.

CALIBRATION

Immerse the tester up to the maximum immersion level in pH 6.86 buffer solution.

Allow the reading to stabilize and using a small screwdriver adjust the calibration trimmer to read 6.86

Immerse the electrode in pH 4.01 or pH 9.18 the standard buffer solution of borax

Until the display shows 3.96-4.04pH or 9.13-9.23pH

Always use fresh buffers for calibration.

Important  the instrument must be re-calibrated whenever

The electrode has been used in particularly taxing conditions

The utmost accuracy is required

BATTERY REPLACEMENT

When the battery symbol----appears on the display, this indicates a low battery and only 1 hour of continuous use remain. Though the unit may continue to function, the accuracy of the unit will be affected beyond the 1 hour, twist open the battery compartment lid. remove old battery and replace with fresh ones noting polarity as show in battery compartment.