Replacement cartridges/ampoules for the Draeger Flow Check small-scale smoke generator. 3 cartridges in the pack and a blue card nozzle.
A bit more expensive ‘per tube’ than the Draeger glass acid smoke tubes but I’m certain they are cheaper in practice.
When the Flow Check is switched off the liquid in the ampoule is retained – for the next use (I have used them three weeks later after opening). The problem with the glass acid containing tubes is that once opened they become exhausted in s short period of time – even if not actively being used.
These Flow Check tubes are cleared for use in most Pharmaceutical and Food factories – which the glass/acid ones are not!