Glassware volume calibration service offered for glassware < 6.0L. Volume at 20 degrees C of glassware vessel is gravimetrically determined. This service is used primarily by outside groups for volumetric calibration of dissolved oxygen flasks. All ODF/STS dissolved oxygen and volumetric flasks are calibrated. Methods and equations follow Culberson et al (1991) A comparison of methods for the determination of dissolved oxygen in seawater. WHP office report WHPO-91-2.