Aquarium Test Glass Tube (6-Pack | 5-Ml | 4 X1/2 Inch) For Fresh & Salt Water Aquarium Lab Test

Package include : 6 pcs ; Material : Glass body & plastic cap ; Size : 4inch(102mm) x 1/2inch(12mm) (D x L) ; Great for aquarium water quality testtest hardness carbonate nitrate nitrite pH & more etc ; Also for scientific experimentclassroomlab and so on .