Made to API/ASTM oil testing standards, Robinson’s 100mL pear shape centrifuge tubes are constructed from clear annealed glass, and feature etched white graduation lines for clear and accurate readings. These 200 part tubes are marked from 0 to 200% to allow direct volume readings from test samples. Tubes are available with the conventional neck opening to accept a cork style stopper (corks sold separately), or with a threaded neck to take a screw style cap (screw caps included).

As an added option, tubes can come factory verified or third-party certified. Factory verified tubes are accompanied by a certificate of accuracy. Certified tubes are volumetrically checked by an independent third-party laboratory according to API standards and come with a certificate depicting volume corrections at each checkpoint. (additional charges apply)

Divisions of Graduation:

• 0 to 3% in 0.1%
• 3 to 5% in 0.5%
• 5 to 10% in 1%
• 10 to 100% in 10%
• and from 100 to 200% in 20%