Vernier Caliper

Features:

• 7½" caliper with Vernier scale and nylon tips.
• Precision instrument that gives accurate readings for all lens blanks up to 80mm. 
• Common tool used in laboratories and industries to accurately determine the fraction part of the least count division.
• Convenient tool to use when measuring the length of an object, the outer diameter (OD) of a round or cylindrical object, the inner diameter (ID) of a pipe, and the depth of a hole.