000 00233nam a2200073 4500
080 _a
_b
245 _aIS: 2711 - 1966 (with amendment no.1 - 1971) : Specification for direct reading pH meters
700 _aINDIAN STANDARDS INSTITUTION
260 _aNew Delhi
_bBIS
_c1966
300 _a7p
999 _c26571
_d26571