This handy paper calculator helps the beekeeper, beginner or advanced, easily determine the timing of various stages of queen cell development. A queen breeder can select grafting day and then see at a glance when cells need to go be removed from the finisher and move into mating nucs, when mating flights should occur and when mated queens can be harvested. Convenient photos of the stages can help any beekeeper estimate the timing of a queen cell in progress. Printed on card stock with a rotating paper wheel in the center.
Produced by Lyson in Poland.