Aquarium Test Glass Tube (6-Pack | 5-ml | 4 x1/2 inch) for Fresh & Salt Water Aquarium Lab Test

About this item Package include : 6 pcs ; Material : Glass body & plastic cap ; Size : 4”(102mm) x 1/2”(12mm) (D x L) ; Great for aquarium water quality test,test hardness, carbonate, nitrate, nitrite, pH & more, etc ; Also for scientific experiment,classroom,lab and so on .