Bluelab pH Bundle pH 4.0 Calibration Solution, pH 7.0 Calibration Solution

Bluelab pH 4.0 and pH 7.0 Calibration Solution pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened. Uses: The blue lab 2.77 calibration solution wait until the reading stops moving this may take a minute or two press the Cal button down on the pen waltz in the solution