Schilling Burette Consists Of A One Litre Bottle Made Of Polyethylene A Filling Tube A Calibrated Burette With Zero Point Fiction, A Discharge Nozzle And A Lever Mechanism For Rapid Discharge. The Burette Is Filled Simply By Squeezing The Bottle. As Soon As The Bottle Is Released, The Liquid Is Sucked Up Until The Burette Is Set To Zero. Excess Liquid Drains Back Through The Delivery Tube Into The Bottle.