1.1 This standard lays down recommendations for design of linear scales and indexes for quantitative instruments to be read to a resolution within 0·33 to 0·62 and 0·67 to l·25 percent of the scale range. These recommen-dations are applicable only to single scale, single range instruments having dials with full circle, part circle or straight scales.
1.2 These recommendations are not applicable to trans-illuminated dials, moving-scale with fixed-index instruments or to scales which have substantially non-linear characteristics.
IS 8525-1977 history
1977IS 8525-1977 The design of the linear scale and index used to indicate the instrument recommends a reading resolution of 0.33-1.25%