Hanna (HI7004L) Ph 4.01 Buffer Caliberation Solution; 500mL Sodium Removal3842 The double-open-end (DOE) design ensures

The double-open-end (DOE) design ensures compatibility with residential and industrial pressure housings from major manufacturers

5" size fits existing housings with no adapters or modifications

Fits all permanent E-Series filter heads without adapters or modifications

Tested for chlorine

Hanna (HI7004L) Ph 4.01 Buffer Caliberation Solution; 500mL Sodium Removal3842 The double-open-end (DOE) design ensuresHanna Instruments HI7004L pH 4. 01 Calibration Buffer Solution NIST traceable reference standard for accurate pH meter calibration in acidic range applications 500mL Bottle pH 4. 01 0. 01 Certificate of Analysis Temperature Correlated The Hanna HI7004L is a laboratory grade pH 4. 01 buffer solution prepared to precise formulas and standardized against NIST certified meters. Each 500mL bottle includes batch number, expiration date, temperature