The original! Instantly check for water migration. Map the migration of water in carpet and pad without straining your back. The HydroSensor I has a 31" reach to save your knees and back. Sensitive nickel-plated points alert you to moisture content above 17%. Use only on carpet and pad. Saves your back with a 31" reach. Stainless steel construction. Nickel-plated, retractable points.