For aquarium enthusiasts, these test tubes are essential for water testing. Collect water samples from your tank and use the test tubes, and other important parameters. The clear glass makes it easy to see the results, and the cork stoppers keep the samples secure until you're ready to test them. This helps maintain a healthy environment for your aquatic pets. Features -Color:Transparent -Material:Plastic -Size:6.00X1.20X1.20cm/2.36X0.47X0.47in -Convenient disposable design: these test tubes are intended for singleuse, promoting and preventing crosscontamination in laboratory environments -Versatile sizes: available in a range of sizes to suit various experimental requirements, offering flexibility and adaptability for different scientific tasks -Leakresistant stoppers: each test tube is equipped with a secure stopper to prevent leaks, ensuring the safety and integrity of your samples -Robust plastic material: made from plastic that is durable and resistant to cracking, providing reliable and use -Ample supply: the enough tubes pack is for largescale experiments, ensuring you have an adequate number of test tubes for all your needs Package list: 20 Tubes