bluelab pH Pen Faq & Troubleshooting

Temperature under range
Temperature over range
Probe not hydrated or clean
Follow the cleaning and
calibration steps
Probe damaged
Replace the pH pen
pH under range
pH over range
Wrong calibration sequence
Calibrate to pH 7 first, then to
pH 4
Probe damaged
Replace the pH pen

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)