FAQ and Troubleshooting: Bluelab Multimedia pH Meter

General Questions

Bluelab Multimedia pH Meter 1-medium-3

How do I change the batteries?

  • Batteries are replaced in the Bluelab Multimedia pH Meter when the low battery indicator appears on the screen.
  • Open battery compartment by sliding the back cover down and insert 2x AAA batteries as shown on the battery holder. Slide the cover back on. Note: Alkaline batteries are recommended.
  • Important: Check the batteries at least every 6 months for signs of deterioration, rusting or swelling.

How often do I have to clean and calibrate my probe?

When the calibration indicator disappears from the display (every 30 days) remember to:

  1. Clean the Bluelab Leap pH probe tip with Bluelab pH Probe Cleaner.

  2. Calibrate the Leap pH Probe to two points: pH 7 and pH 4 (or pH 10)
  3. Hydrate/store the sensor. Ensure the cap always contains KCl Storage Solution.

    The Bluelab Probe Care Kit pH can help you with all your cleaning and calibration needs.

There is a salt crust on my Leap pH probe – why?

  • The Leap pH probe and the storage cap contains KCl (Potassium Chloride) solution. The result of a small level of evaporation of KCl is the formation of a salt crust as KCl is a type of salt.
  • This salt crust is normal and will not harm the probe or meter. Gently wash the salt off under fresh running water. It is essential to ensure that your probe always has sufficient KCl in the storage cap to remain hydrated.

My Leap pH probe has accidentally dried out, what should I do?

The probe must be rehydrated for 24 hours in KCI storage solution (never use RO, distilled or deionised water). Next, carry out a calibration to check the probe hasn’t suffered permanent damage.

My pH reading is stuck on 7 pH, what should I do?

Inspect the glassware for damage. If your meter pH reading is stuck on 7 pH (or close to that), it is likely the glassware is damaged. The Leap pH probe likely needs replacing.

How do I replace the Leap pH probe?

1. Attach the probe: Connect the probe to the meter via the BNC fitting.

2. Remove the storage cap. Grip the top of the cap and gently twist the base one rotation clockwise to loosen slightly. Next slowly slide the cap off the Leap pH probe. 

3. Calibrate your Leap pH Probe to your meter.

Caution: When the Leap pH Probe is not in use, add enough Bluelab® pH Probe KCl Storage Solution to the storage cap so the probe tip is covered. Then replace the cap and store in a secure place.









pH reading inaccurate

Contaminated Bluelab
Leap pH Probe /
glassware not clean.

Clean probe; then calibrate.

Bridge contaminated,
blocked or dry.

Hydrate probe in KCl storage
solution for 24 hours, see section
9.0. Do not measure proteins or
oils with this unit. Replace unit

Incorrect pH calibration.

Ensure calibration solutions are
accurate. Replace if in doubt.
Wait longer for readings to
stabilize before calibrating to a
constant value.

pH calibration unreliable.

Re -calibrate Bluelab Leap pH

Bluelab Leap pH Probe
damaged or old.

Replace Bluelab Leap pH

pH reading does not change from solution to solution

Broken glass bulb, tube or connector

Check pH probe for damage. Replace pH probe

Displays low battery indicator

Insufficient power to take a reliable reading

Replace the batteries. DO NOT use rechargeable batteries

No display

Batteries dead or inserted incorrectly

Check batteries are inserted correctly. Replace if necessary

Display shows ‘Err’

Problem with pH calibration

See error message descriptions in section 10 of the Bluelab Combo Meter Manual

Further resources:      

Getting started: The Bluelab Multimedia pH Meter

How to hydrate your pH probe

How to clean Bluelab pH Pen and Bluelab pH Probes [+ video]

FAQ and troubleshooting for Bluelab pH probes