Rapid ECH0233B Burette Acrylic 50ml is durable, lightweight, and resists shattering, impact, and most non-abrasive cleaners including ammonia and strong detergents. The ±0.10mL tolerance meets ASTM Class B / DIN ISO 385 standards for precision. Comes fitted with a polytetrafluoroethylene (PTFE) plastic plunger key stopcock, providing low friction use while resisting chemicals, moisture, and high temperatures. The burette has an easy-to-read scale with 0.10ml graduations. Calibrated for delivery. Note: Not for use with hydrofluoric acid or ammonium hydroxide. Not autoclavable. Replacement 4” stopcock plunger: CH0233BSPR. * Burette, 50ml capacity * Class B, ± 0.1ml tolerance as per DIN ISO 385 standards for precision * Burette has chemical-resistant blue printed scale in 0.1ml graduations * Includes an attached PTFE straight bore stopcock * Made of high quality acrylic; tolerates most dilute minerals, acids, and bases