BUREAU OF INDIAN STANDARDS <br/><br/>
INDIAN STANDARD SPECIFICATION FOR DIRECT READING pH METERS IS 2711-1979 INDIAN STANDARD SPECIFICATION FOR DIRECT READING pH METERS IS 2711-1979 

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 - NEW DELHI  BIS  2020 
 - 13 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CIVIL ENGG DIRECT READING pH METERS 
<br/><br/><label>Dewey Class. No.: </label>620.106 BIS  / BUR