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The robotic Roomba vacuum cleaner has a new partner. iRobot's Scooba is an automatic mop that is slightly larger and heavier than Roomba and costs $399. It comes with a battery charger, a battery pack, cleaning solution, a spare front-wheel assembly, and a battery-powered "virtual wall," which sends out an infrared beam that Scooba won't cross. You're supposed to remove rugs or furniture, as you would during mopping. Scooba isn't for unsealed or laminated wood floors.
Scooba spirals around the room until it bumps into an obstacle, then follows its edge or sets off in another direction. It sweeps up debris, squirts in the cleaning solution, then slurps up the dirty solution into a holding tank. When finished, it dries itself so that it won't drip when you pick it up. Then it beeps when it's done.
How we tested. In a tiled lab room, we placed a chair, a stool, and a table, and a drop of mustard for every foot of tile. Then we let Scooba loose and kept track of how ...