bluelab pH Pen Faq & Troubleshooting

Drift – readings slowly
varying
Glassware not clean
Clean glassware, hydrate, then
calibrate
Wick contaminated or blocked
Soak probe in KCl storage
solution for 24 hours and
retest. Don't measure proteins
or oils with the pH pen. You
may need to replace the pH
pen.
Glassware aged
Replace the pH pen
Unsuccessful calibration
Glassware not clean
Clean glassware
Glassware aged (glassware
won't clean)
Replace the pH pen
Probe not hydrated
Soak the probe in KCl solution
for 24 hours and retest
Noisy – readings jumping
around
Contact zone not immersed
correctly
Lower pen into solution at
least 2cm/1"
Reading stuck on 7 pH
Broken glassware
Replace the pH pen
Incorrect sample reading
following successful
calibration
Wick blocked
Soak probe in KCl storage
solution for 24 hours and
retest. Don't measure proteins
or oils with the pH pen.
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How to take a measurement with the Bluelab
pH Pen
Before you use the Bluelab pH Pen, you need to hydrate the probe tip in KCl storage solution for
24 hours, then calibrate the pen to 2 pH points.
• How to hydrate your pH pen
• How to calibrate your pH pen
1. Turn the pH pen on

bluelab pH Pen Specifications

General

Measurement Range	0.0 - 14.0 pH
Accuracy	+/- 0.1 pH
Resolution	0.1 pH
Automatic Temperature Compensation	Yes
Power Source	1 x AAA battery
Waterproof	Yes
Waterproof Rating	IP67
Calibration	Two-point calibration
Temperature Range	0 - 50 °C (32 - 122 °F)