The Palm Abbe is a fourth-generation digital handheld refractometer. Offering laboratory precision, the Palm Abbe refractometer is fast, convenient, and easy to use. Users place a drop or two of fluid in the well and press a button on the key-pad. The custom-designed microprocessor delivers a nearly instantaneous readout in refractive index, degrees Brix or any one of a thousand different units of measure, allowing users to read directly in the units desired. Nonlinear temperature compensation is automatic and insures that fluids read between 0 and 50 degrees C (32 to 122 degrees F) are measured accurately.