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Hello Joe,

I don't this is a sextant at all - hope you don't buy it as such.

It was fun tracking it down, and I found the manual (attached below).

Google Translation of the "introduction" is this:

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Our food refractometer (previously called refractometer for the sugar and oil industry) is used not only in the sugar and oil industry but also in numerous other food tests. The refractory determination of the refractive index or the dry matter content of liquids (juices, solutions, oils, fats, etc.) enables a rapid characterization of the substance. In addition to the fast execution of a measurement, the simple handling and the low substance consumption are particularly advantageous. The food refractometer is particularly suitable for series investigations due to its design with horizontal measuring prism. Areas of application Oil, fat, butter and margarine industry Purity studies of vegetable and animal fats and oils as well as fat mixtures

Reference

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Hope that helps.

Kind Regards, Geoff Hitchcox, Christchurch, New Zealand.