pH measurement.  Part 2,  specification for reference value standard solutions and operational reference standard solutions / 
British Standards Institution. 
 - 20 pages :  illustrations ;  33cm. 
 - British standard ;  BS 1647 : Part 2 : 1984 .
 - British standard ;  BS 1647 : Part 2 : 1984 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrogen-ion concentration--Measurement.<br/>Hydrogen-ion concentration--Buffer solutions.