DR SCHILLING BURETTE COATED GLASS 1L PE BOTTLE 50X0.10MLDr Schilling pattern. Class B. Borosilicate glass burette tube with Schellbach stripe, plastic coated for safety critical operation and mounted on a low density polyethylene flexible bottle. With PVC discharge tube and HDPE support base. Screw adjustment and a push button provide fine to coarse delivery of liquid. Rapid filling is achieved by squeezing the reservoir bottle.