These viscosity tubes are for rough control work where bubble comparison is made to limit samples of known viscosity.
- Flat bottomed
- Durable white ceramic enamel lines at 27 mm, 100 mm and 108 mm from the outside bottom
- Reference ASTM D1545
- Manufactured from 51 expansion borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class B requirements