The inner diameter of a test tube can be measured accurately using a?
A
micrometer screw guage
B
pair of dividers
C
metre rule
D
pair of vernier calipers
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
A Vernier caliper is an instrument used to measure both the outer and inner diameters of a tube.
Source: Myschool Past Questions Archive (Record #295)