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4. The following apparatus shall be used:
(a)A Lovibond `all purposes' comparator complete with stand for work in reflected light.
(b)A Lovibond comparator disc A.P.T.W. or A.P.T.W.7.
(c)Two fused glass cells, 25 mm. depth.
(d)A water bath or incubator capable of being maintained at 37.5°C. ± 0.5°C.
(e)A pipette to deliver 5.0 ml.
(f)A supply of 1.0 ml. straight-sided pipettes of an accuracy equal to that of N.P.L. grade B.
(g)A 1,000 ml. graduated flask.
(h)A 100 ml. measuring cylinder.
(i)A supply of test tubes conforming to British Standard 3218: 1982, nominal size 150/16, with rubber stoppers to fit.
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