Principle

The students should measure length, diameter, and hole depth of
various objects with a measuring tape and/or vernier caliper as
possible. In doing this they should choose and use the more
suitable measuring device. The results should be entered in the
table as a numerical value and its unit. The symbol for the
length  (l )  and the diameter  (d
)  should also be used. The average value  (AV
)  of each set of 3 measurements should be
determined.