testi the pH value, is general convention Guang Fan tests. test scope and precision: pH1-11 or 1-10 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
testi the pH value, is general convention Guang Fan tests.
test scope and precision: pH1-11 or 1-10 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
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