PTB will provide traceability to customers in the United Kingdom by calibrating master hydrometers to an uncertainty of measurement of
Final Report, 17 November 2004
Now all UK hydrometer calibration laboratories use solid sinkers as density reference and so there is no need to maintain the calibration of this special type of master hydrometers.
With consent of NPL, this traceability project is therefore officially closed.
The demand is expected to be about six calibrations every two years.