Reading a Vernier Caliper

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TM 9-243 READING A VERNIER CALIPER - Continued Most vernier calipers read “OUTSIDE” on one side and “INSIDE” on the other side. If a scale isn’t marked, and you want to take an inside measurement, read the scale as you would for an outside diameter. Then add the measuring point allowance by referring to manufac- turer’s instructions or the following table. Size of English Metric Caliper Measure Measure 6 inch or 150 mm Add 0.250 inch Add 6.35 mm 12 inch or 300 mm .300 inch 7.62 mm 24 inch or 600 mm .300 inch 7.62 mm 36 inch or 600 mm .500 inch 12.70 mm READING A METRIC CALIPER The steel rule (1) is divided into centimeters (cm) (2) and the longest lines represent 10 millimeters each. Each millimeter is divided into quarters. The vernier scale (3) is divided into 25 parts and is numbered 0, 5, 10, 15, 20 and 25. Read the total number of millimeters (4) to the left of the vernier zero index (5) and record . . . . . . . . . . . . .32.00 mm Read the number of quarters (6) between the millimeter mark and the zero index and record . . . . . . . . .25 mm = (1 quarter) Read the highest line on the vernier scale (3) which lines up with the line on the scale (7) and record . . . . . . . . . . . . . . .18 mm TOTAL 32.43 mm CARE OF CALIPERS 1. Store calipers in separate containers provided. 2. Keep graduations and markings on all calipers clean and legible. 3. Do not drop any caliper. Small nicks or scratches can cause inaccurate measurements. 4. Protect caliper points from damage. Change 1 6-5/(6-6 blank)

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