Johnson’s building calculator provides quick and accurate solutions for layout work and estimates, including pre-programmed right angle and stair calculations. Complete stair layouts, as well as roof, rafter and framing with powerful built-in solutions and advanced features to complete your work faster and more efficiently. Use it in the field or office to save time and reduce costs. Its oversized LCD is easy to read and converts measurements in both English and Metric and the paperless tape mode is useful for checking figures while scrolling through the past twenty entries. Comes with durable protective case, user manual and handy reference guide. Work in and convert between feet-inch-fractions, decimal feet-inches and metric, including area D: M: S to decimal degree conversions Calculates weight per volume Stair calculations for risers, treads, stringer length and incline angle; displays run and rise Battery Type: CR2016 Solar Powered: No Warranty: 1-year limited CA Residents: Prop 65 Warning(s): Yes UNSPSC: 44101800