Professional masonry contractors need their levels to be tough enough to withstand repeated trowel blows, designed to be 3 times heavier than our 920 Shark this level is sure to outperform. Kapro's 930 Smartcast level is the only mason's level on the market to offer the unique advantages of optimal visibility and shock-absorbing strike pads that also function as end caps. A bridge at the horizontal vial adds increased impact resistance and allows the user to easily mark a continuous line. Featuring our PATENTED Optivision vials a Kapro invention that creates the effect of strong color definition around the spirit level's horizontal bubble, in stark contrast to the white vial background and clear liquid. The color contrast makes the bubble edges significantly easier to see - for fast and accurate placement between the vial's reading lines. The horizontal vial has gradient line markings to give up to 2% grade for easy leveling of slopes.