Universal Handy Refractometer

A most accurate and convenient model of universal hand refractrometer with a selector knob to indicate measurement range from 0-90% Accuracy 2%, Incorporates built in Acmi-prism and special light reflection system for colour eliminator to obtain sharp critical boundary line and optimum contrast Hand Refractrometers also available in three separate ranges Model b. 0-32% c. 28-62% d. 58-90%