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Precision Diameter Tapes are made from a single piece of stainless alloy. The material is cut in one piece using non aggressive methods creating two tape sections. The first is the Gage member, and the second is the Vernier member. The curved transition from the Vernier to the Gage member allows each member of the tape to be matched together without overlapping. This gives the greatest degree of measuring accuracy. To accurately use the tape, clean both the object being measured and the tape. Wrap the tape around the object and align the Vernier gradients along side of the Gage member gradients. To read a precise measurement, apply a tension of 5 lbs. (2.25 kg.) to the tape by pulling the knob on the end of tape. For the most accurate reading use a calibrated tension scale. Accurately reading a precision diameter tape is simple and straight forward. In the illustration above, assume the tape has been stretched around a pipe that is approximately 42” in diameter, and the proper 5 lbs. of pull has been put on the tape. Start by reading the first dimension to the left of the “0” on the Vernier member. In the example we have 42.125. Next, find the gradients that line up exactly between the Gage member and the Vernier member. Read the number on the Vernier scale. In this example the number is 17. Add this extension to the 42.125 to arrive at the exact measurement of 42.142. Metric tapes are graduated in millimeters with each gradient being .5 mm. On the Vernier scale each gradient represents .01 mm. Readings are taken the same as the illustration above. For measuring very large diameter objects, assistance should be requested, or the measuring tape should be secured by means of masking tape to assure a parallel measurement.
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