A vernier caliper can be used to measure diameters and thicknesses accurately. It has inside jaws, outside jaws, a vernier scale, main scale, depth gauge. The inside jaws measure internal diameters, outside jaws measure external diameters, and the depth gauge measures depths of holes. To take an accurate reading, the zero point on the vernier scale is matched to the main scale to get a rough reading, then the vernier divisions are checked against the main scale for the precise reading.

1. Use of Vernier CaliperUse of Vernier Caliper
Vernier CaliperVernier Caliper
can be used tocan be used to
measure diameter,measure diameter,
thickness verythickness very
accurately.accurately.
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2. Different Parts of Vernier CaliperDifferent Parts of Vernier Caliper
InsideInside
jawsjaws
OutsideOutside
jawsjaws
VernierVernier
ScaleScale
MainMain
ScaleScale
DepthDepth
GaugeGauge
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3. Measuring Internal DiameterMeasuring Internal Diameter
Use the insideUse the inside
jaws of thejaws of the
caliper as showncaliper as shown
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4. Measuring External DiameterMeasuring External Diameter
Use the outside jaws ofUse the outside jaws of
the caliper as shownthe caliper as shown
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5. Measuring Depth of a HoleMeasuring Depth of a Hole
Use the depthUse the depth
gauge of thegauge of the
caliper as showncaliper as shown
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6. Reading the Vernier ScaleReading the Vernier Scale
Read the “0” position of theRead the “0” position of the
vernier scale on the mainvernier scale on the main
scale to get a rough reading.scale to get a rough reading.
Rough reading = 18mmRough reading = 18mm
Look along the vernier scaleLook along the vernier scale
until one of the vernieruntil one of the vernier
division coincides with thedivision coincides with the
main scalemain scale
Accurate reading =Accurate reading =
18.46mm±0.01 mm18.46mm±0.01 mm
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7. ExerciseExercise
What is the reading in the caliper shown?What is the reading in the caliper shown?
Please click on one of the following answer.Please click on one of the following answer.
A. 3.51cm
B. 3.57cm
C. 3.62cm
D. 3.642cm
E. 3.67cm
3.5
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0 5 10
3 4
overlap

8. You Are Wrong!You Are Wrong!
See the Solution
Try Again
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9. Congratulation!Congratulation!
You are Right!You are Right!
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10. 0 5 10
3 4
overlap
SolutionSolution
Read the “0” position of the
vernier scale on the main scale
to get a rough reading.
Rough reading = 3.6cm
Look along the vernier scale
until one of the vernier division
coincides with the main scale
Accurate reading =
3.67cm±0.005cm
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