This 25mL burette is manufactured from precisely bored borosilicate 3.3 glass with a PTFE needle valve rotaflow stopcock for exceptionally fine flow control. The burette meets Class A accuracy per DIN ISO 385, with a tolerance of ±0.05mL and 0.10mL graduation subdivisions. Chemical-resistant blue printing ensures long-lasting readability. The rotaflow stopcock uses a needle valve mechanism that provides smoother, more precise flow regulation than standard glass or PTFE stopcocks, making it particularly well suited for titrations requiring drop-by-drop addition. Calibrated for delivery.