Bluelab pH 4.0 calibration solution 250ml

pH measuring equipment should be regularly cleaned and calibrated so that the user can be sure that the readings are accurate. The pH testers are calibrated using pH7.0 (buffer) and pH4.0 (bias) solutions before each measurement. Calibration solutions should be stored in cool places away from direct sunlight and heat.

When to calibrate your pH pen or probe:

• Before first use
• If the calibration reminder has disappeared from the LCD screen (30 days after the first calibration)
• If the pH reading is different than expected
• After cleansing and hydration
• After changing the batteries

To calibrate your pH pen or probe, follow the steps below:

1. Make sure your pen or probe is clean and hydrated.
2. Turn on the pH pen or probe. Press the power/hold button.
3. First calibrate to pH 7. Place the probe tip in fresh Bluelab pH 7.0 calibration solution. Wait for the reading to stabilize between pH 6.6 - pH 7.5. Long press the Cal button on the pen or meter until "CAL" is displayed. Release button. A calibration sequence will begin with the display flashing "0" continuously. Once "0000" stops flashing, the sequence is complete and "pH7" is displayed.
4. Rinse. Rinse the tip of the pen or probe thoroughly in clean tap water and shake off any excess.
5. Calibrate to pH 4. Place the probe tip in fresh Bluelab pH 4.0 calibration solution. Wait for the reading to stabilize between 3.6 pH - 4.5 pH . Long press the Cal button until “CAL” is displayed. Release button. A calibration sequence will begin with the display flashing "0" continuously. Once “0000” stops flashing, the sequence is complete and “pH4” is displayed.
6. Confirm the calibration. A calibration confirmation will appear at the bottom of the pen or probe screen to indicate a successful calibration. It will disappear after 30 days to indicate that a new calibration is required.