Botyro Refractometer DR-195 This instrument can be used for measuring on oils, fats and waxes giving a reading directly in terms of the oil scale, otherwise known as BUTYRO Scale. The micrometer eye piece allows an accuracy on their scale of 0.1. the soil scale may also be conversion tables. This allows as measuring on materials with index of refraction in the range 1.42 to 1.49 to an accuracy of 0.0002. Dual scale : Sugar Percentage Scale & Butyro Scale. Subdivided at 1% interval. Easy Temperature Control. No Coloration of the filed view. Micrometer allows accuracy of 0.01% on the oil (Butyro) scale.