Bluelab pH 4.0 Calibration Solution 250 ml (6/Cs) The lid is compatible with

The lid is compatible with both sizes

replaceable double junction pH probe and temperature probe (for pH ATC)

Flanges range in size from 4 in to 20 in depending on your specific needs

Silica Blast reinforces and enhances plant tissues leading to bigger harvests

Bluelab pH 4.0 Calibration Solution 250 ml (6/Cs) The lid is compatible withpH 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.""