All levels have plumb and level indicators. Montgomery’s Slope Levels are unique in that they have plumb and level indicators, but also slope indicators. Unlike digit levels, the Slope Level is durable and easy to use. No more calibrating. We pride ourselves in knowing our levels are made from high quality materials, as well as thoroughly inspected for accuracy and durability. Each level is hand inspected, climate tested and drop tested. We want our customers to be as confident in our products and services as we are. Because of that confidence, we offer a 100% Money Back Guarantee* if you are not completely satisfied with your level. Think of it as having 7 tools in 1. Each level can check Plumb, Level, Pitch, Degree, includes a Ruler with inches and metric, and can act a a straight edge. The levels are available in 4 different sizes: 16, 24, 32 and 48 inches. Also available in metric sizes 40, 60, 80 and 120 Centimeters.