If you want higher Floor Levelness numbers, the S-840 will provide you with better performance than any other mechanical method and is one of the most versatile concrete machines available. The S-840 has three options for your convenience: a fully automated self-leveling screed head, a raking head, and a sub-grade head. The automated screed process increases profitability by providing fewer man hours per project, and its custom control system provides faster elevation and SLS response. The S-840 can screed up to 5,000 square feet on average per hour.