1642A Acid Burette with stopcock, Class A Description: Acid burette is a titration that commonly be used in analytical chemistry instrument. It can only be used acidic solution. It can be used for acid-base titration tests. There are 4 sizes available: 10ml acid burette with stopcock, 25ml acid burette with stopcock, 50ml acid burette with stopcock, 100ml acid burette with stopcock. Material: Neutral glass Color: Clear Key Product Features: 1.Used for acid-base titration tests. 2.Calibrated to deliver 3.With good quality 4.High accuracy 1641A Burette, with rubber tubing connection, glass bead and glass tip, Class A Description: Burette is commonly used in analytical chemistry titration instruments ,and it can only be used alkaline solution. It can be used for acid-base titration experiments. There are 4 sizes available: 10ml burette with rubber tubing connection, 25ml burette with rubber tubing connection, 50ml burette with rubber tubing connection, 100ml burette with rubber tubing connection. Material: Neutral glass Color: Clear Key Product Features: 1.Buret for laboratory use 2.Acrylic for durability 3.Polytetrafluoroethylene (PTFE) plastic plunger stopcock for resistance to chemicals, moisture, and high temperatures 4.Suitable for high school or college students, or ages 14 to 21 5.High quality