A Refractometer that every beekeeper can afford. Beekeepers are analytical by nature and we all need to know the moisture content of our honey. It only takes a drop of honey to put on the lens. You hold it in full sun and easily determine the moisture of your honey. Full, easy to understand instructions come with it. We have tested this unit side by side with the expensive models and they perform exactly the same. This is not a plastic tool; rather it is constructed from steel and will last a lifetime. Fully calibrated. "