Floating a slab surface gets easier with the Mag Vibe, a battery-operated vibrator that attaches to any magnesium float. The vibration can be easily adjusted to match conditions and it comes with a rechargeable battery that will hold a charge for four hours. The 10-pound vibrator attachment can be removed and transferred to another float of any size very quickly without any tools. It also works well to float in color hardeners. www.magvibe.com