Right after the blank glasswares are produced, ISOLAB accomplishes the calibration process with fully automatic state-of-art calibration machines which are only used rarely by well known manufacturers.

The following steps are carried out by fully automated computer controlled machines with the highest level of precision:

 Filling in the blanks with precisely defined amount of water under fixed temperature.
Application of the calibration mark with a diamond tool at the lowest meniscus point.
Cylinders, burettes and pipettes; application and marking of minimum two calibration lines.
The wet surface area factor is always taken into account throughout the process.


All calibration laboratories at ISOLAB are strictly controlled and the regular calibration temperature is 20 °C. This temperature is very important for the accuracy so that if the environmental temperature is different than 20°C, calibration machines have to be adjusted accordingly.
All volumetric glassware is calibrated either as “To contain” “TC, In” or “To deliver” “TD, Ex”.

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