pH measurement.  Part 1,  specification for pH scale / 
British Standards Institution. 
 - 7 pages ;  33cm. 
 - British standard ;  BS 1647 : Part 1 : 1984 .
 - British standard ;  BS 1647 : Part 1 : 1984 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bases (Chemistry)<br/>Hydrogen-ion concentration.