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- Vernier caliper with accuracy 0.01mm.
- Micrometer with accuracy 0.01mm.
- Different metallic balls, rods and cylinders.
- Lenses with different focal length.
- Vernier caliber: used to determine the outer and inner dimensions of a body, and also used to determine the depth.
- Micrometer: is used to determine thickness, diameter of wire or small balls.
- Spherometer: is used to determine the radius of curvature of a sphere or a curved surface.