Review on Leak-Proof Screw Cap Glass Test Tubes Set of 6, 85mm Length with 5 ml Marking, Perfect for Aquarium Water Tests - Tililly Concepts by Janice Wilson

Bought to replace API tubes [which are fragile and have horrible, disgusting lids], these tubes are somehow much worse. They are not manufactured with any degree of consistency and apparently there are no QA/QC (Quality Assurance/Quality Control) standards at the factory in India. Each of the 6 tubes I received was a different length. The holes were too narrow, making draining less efficient. The 5mL mark was also slightly different for each tube. Also, and worst of all, the 5ml labeling was completely inaccurate. I compared these measurements to API test tubes, 1 industrial syringe, 1 medical syringe, and a tiny measuring cup. In all cases these tubes held more than the estimated 5mL. I have no idea how others rated them so highly. The quality of the product delivered is either very variable or people shouldn't pay enough attention to what they are getting even if the health of their tank/fish is at stake. They are returned and the search for a quality API replacement continues.