FIELD: chemical and pharmaceutical industries. SUBSTANCE: indicating tube has bottle with removable sealing members position on both sides of bottle. One or two data reading scales are applied on bottle. Indicating power is arranged inside bottle between two arresters. The latter are made removable and re-usable. They can be displaced when it is necessary to change packing density of indicating power. At least one of arresters is made of polymeric net and plug with opening. EFFECT: higher results of analysis. 3 cl, 1 dwg
