BeadBath Duo, 2L bath, 115V, Cat. No.: BM-B2402, The BeadBath Duo series are the first laboratory baths designed for precision temperature control when used with water, or with (the increasingly popular) Lab Armor® thermal beads. Unlike any other laboratory bath, they feature a “MODE” button that can be used to toggle between “Bead” or “Water” mode. Choosing the correct mode will automatically adjust the operation and balance of the multiple internal heating and sensing elements to ensure optimal performance. The result is one combination bath that is suitable for accurate, and uniform temperature control in either condition.