About long calipers
Steel rules are commonly used to roughly measure large workpieces but if a little more accuracy is needed then a long caliper is suitable for the job. A long caliper is very convenient for is its user friendliness but does require some care in use. In the first place it is important to realize there is no relationship between resolution and accuracy. For details, refer to the values in our catalogue. Resolution is constant whereas the accuracy obtainable varies dramatically according to how the caliper is used. The measuring method with this instrument is a concern since distortion of the main beam causes a large amount of the measurement error, so accuracy will vary greatly depending on the method used for supporting the caliper at the time. Also, Be careful to use only the minimum measuring force necessary when using the outside measuring faces as they are furthest away from the main beam, so error rill be at a amanimum here. This precaution is also necessary when using the tips of the outside measuring faces of a long-jaw caliper.