The WINDEX 10 was designed as smaller version of the famous WINDEX 15, which has sold more than one million copies worldwide. The WINDEX 10 is suitable for family or racing sailing boats with mast heights up to 8-9 meters (25-30 feet). Although this is smaller model it retains the famous and superior Sapphire suspension technology, which make is possible to recognize changes in the wind direction as small as one degree. Like all WINDEX models it is extremely sturdy in all wind conditions and it has been wind tunnel tested in speeds up to 80 knots!