During precision assembly, which caliper type is least likely to introduce parallax error?
Vernier caliper with clear scale markings
Parallax error arises whenever the reading scale and the indicating feature lie in different planes, so that tilting the line of sight shifts the apparent reading; the cure is an instrument that is read directly with both marks in one plane.
A spring caliper has pointed legs but no scale of its own; the size it holds must be laid against a separate rule and read by eye, so the viewing angle readily introduces parallax.
A transfer caliper likewise only transfers an internal dimension, which is again measured on a rule afterwards, so the same parallax problem applies.
Using a steel rule with inside calipers means judging where the caliper points fall on the rule graduations from a distance, one of the most parallax-prone methods.
A vernier caliper carries its main scale and vernier scale side by side in the same plane, and the reading is taken at the single line where the two scales coincide, so there is little gap for the eye to misjudge.
Because its scales are coplanar and read directly rather than against a remote rule, it is the least affected by parallax during precision assembly.
Hence, the answer is Vernier caliper with clear scale markings.
Similar Questions
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In a vernier caliper, the small scale that slides along the main scale is called:
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[Take least count = 0.1 mm]
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Important Questions from Caliper
How many divisions are graduated on the thimble of micrometer?
The least count of Vernier bevel protractor is ____
In a Vernier calliper, 39 main scale divisions are divided into 40 equal points on the Vernier scale. Then what is its least count (LC) in mm? (Take the value of main scale division = 1mm).
Why are calipers generally used along with a steel rule in workshop measurement?
In a vernier caliper, the small scale that slides along the main scale is called:
