The two essentials needed to correctly calibrate your pH testing equipment. Each bottle is 250ml to ensure over a year of consistent calibration and accuracy for your instruments.

Includes:

• pH4 BLUELAB Calibration Solution 250ml
• pH7 BLUELAB Calibration Solution 250ml

How to calibrate your Bluelab PH Pen:

-Pour the required amount into a separate and contaminate-free container
-Reference chart on the back of the bottle
-Calibrate device following Bluelab product instructions
-Do not pour used solution back into the bottle
-Store in a cool dark place

Calibration should be carried out as often as every month if used regularly or in commercial applications.