(e) 13 parts by weight of distilled water with a conductivity of &lt; = 1 mS/m, and 2 +-1 drops of surfactant.
e) 13 parties (en poids) d &apos; eau distillée ayant une conductivité &lt; =1 mS/m, et 2 +-1 gouttes d &apos; agent mouillant.