YSI 9300 Photometer - Manual (Page 64)

TEST PROCEDURE
1 Fill test tube with sample to the 10 ml mark.
2 Add one Fluoride No 1 tablet, crush and mix to dissolve.
3 Add one Fluoride No 2 tablet, crush and mix to dissolve.
4 Stand for five minutes to allow full color development.
5 Select Phot 14 on photometer.
6 Take photometer reading in usual manner (see photometer instructions).
7 The result is displayed as mg/l F.
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