Marking a scale on a measuring instrument. 

This involves establishing the relationship between indications of a measuring instrument and standard or reference quantity values, which must be applied. Such as  placing a thermometer in melting ice to see whether it reads zero in order to check if it has been calibrated correctly. 

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AQA GCSE Biology 4.1.1.(1-2) Cytology

Student version – available to all, permanently available
non-interactive versions of the tutorials only

Teachers version – on application, short-term appraisal,
fully-interactive versions of the tutorials