Nalgene* Polystyrene Premium Tubing Sizers

Measure the inside diameter (ID) and outer diameter (OD) of tubing. Holes in sizer let you measure the OD of tubing from 1/4 to 1 1/2 in. (6.3 to 38.1 mm). Tabs on either end of the sizer let you measure ID from 1/8 to 1 in. (3.2 to 25.4 mm). Also has rules for measuring length up to 8 in. and 200 mm. Nalgene tubing formulations and applications are printed on the face of the sizer.