Graduated upward to 0.5 mL in divisions of 0.05 mL , from 0.5mL to 3mL in 0.1 mL divisions, from 3 mL to 5 mL in 0.5 mL divisions and from 5 mL to 100 mL in 1 mL divisions. Made with a 3 mm vent hole located 180° from the front of the tube. Tubes are for testing propane, butane and Isobutane mixtures.