The GTR-2-FS fixed-speed tube rocker takes the proven design of the GTR-FS single tier model and adds another tier for even more capacity. With its see-saw motion, a fixed speed of 24rpm and an angle of +/- 25° it provides optimal mixing. The ridged platform pad design allows the operator to place any tube from 1.5mL to 50mL on either tier of the unit, turn the power switch on and walk away.