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roll of pink Teflon tape
0 first (buffer) then to pH 4
The lid is compatible with both sizes
Flanges range in size from 4 in to 20 in depending on your specific needs
Bluelab pH 4.0 Calibration Solution 250 ml (6/Cs) roll of pink Teflon tapepH 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.""
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