It has a double scale. One is oil scale (Butyro Scale) having range of 0 to 100 and accuracy of ± 0.1 read directly on the micrometer. The other is sugar scale having a range of 50-80% with an accuracy of ± 1% also read direct on scale.Specification  : Refraction Range  -  1.42 to 1.49 Accuracy  -  0.0002 Fitted with Sugar & Oil Scale Sugar Scale Reading  -  50-80% Oil Scale Reading  -  0-100% Optional Accessories : Circulating Water Bath for Butyro Refractometer