Buffer pH4.0 Red 125ml

Buffer pH4.0 Red 125ml. To ensure that your pH meter gives accurate readings.

Three point PH calibration procedure:

• Turn the meter on
• Press CAL to enter calibration mode
• Submerge the PH probe in a PH 7 buffer solution until the reading stabilises (beep sound) and the CFM blinks on screen
• Press CFM
• Take the PH probe out and rinse with deionised water
• Submerge the probe in PH 4 buffer solution until the reading stabilises (beep sound) and CFM blinks on the screen.
• Press CFM
• Take the PH probe out and rinse with deionised water
• Submerge the PH probe in PH 10 buffer solution until the reading stabilises (beep sound) and CFM blinks on the screen.
• Press CFM
• Press CAL to save the calibration info and enter measurement. 
• Your meter is now ready

Offset: Should be +/- 30. Anything over 30 indicates that your PH probe needs cleaning. Soak electrode in cleaning solution for 15 minutes, re-calibrate and check offset.

Slope:Should be between 85% to 100%. Less than 80% means you will need to check buffers or replace your PH probe.