$10.00
PORTABLE HYDROPONIC PH PEN METER
The instrument needs to be recalibrated in the following condition.
pH Electrode Maintenance
If the electrode is exposed to air, the resulting values will be slow and not stable - this is because the electrode became dry. You should immerse the electrode into water for few hours.
Low Batt
When the display value is fuzzy or not shown, the battery should be replaced promptly.
Pay attention to the polarity of battery.
- Prolonged use after calibration or lack of use
- The electrode is used very frequently.
- The testing accuracy requirement is very high.
- Press the "CAL" button long time in the air carelessly.
pH Electrode Maintenance
If the electrode is exposed to air, the resulting values will be slow and not stable - this is because the electrode became dry. You should immerse the electrode into water for few hours.
Low Batt
When the display value is fuzzy or not shown, the battery should be replaced promptly.
Pay attention to the polarity of battery.