Pycnometers, Blaubrand^®, Borosilicate glass 3.3.

DIN ISO 3507, gay-lussac type. Including individual certificate. Adjusted. Reference temperature 20°C.
With NS10/19 capillary stopper. Stopper top ground and polished. Inscription in highly contrasting blue enamel. The volume in cm³ is specified to a precision of 3 decimal places. Calibrated to contain. Every pycnometer is calibrated with its own stopper; hence, stoppers are not interchangeable. Each bottle and its stopper is marked with an unique matching identification number.