Refractometer for honey with digital accuracy. The Palm Abbe is fast, convenient and easy to use. The two button interface makes it user friendly; one button takes the reading while the other allows you to step through various menu options. Simply place a drop or two of fluid in the titanium well using the plastic eye dropper and press the Go button. Nonlinear temperature compensation is automatic and insures that fluids read between 32 to 122 °F are measured accurately. Calibration is automatic and does not require the use of special calibration solutions or tools. Requires 2-AAA batteries, included.