Advanced Feet-Inch-Fraction Construction-Math Calculator with Full Trig Functions The Construction Master Pro Trig provides construction professionals with complete trig functions to help them quickly and easily solve complex construction-math problems. It saves time, reduces costs and prevents re-work. You can effortlessly work in and convert between feet-inch-fractions and metric units. Instantly calculate complex construction challenges for stair layouts, roofs, framing and much more. Full trig functions with sine, cosine, tangent, arcsine, arccosine and arctangent. Learn more about this product here: Construction Master Pro Trig Intro and How to Use Construction Calculations Work in and convert between any building dimension, including Metric Trig Function Find Weight per Volume Built-in Right-Angle solutions Complete Stair Layouts Roof, Rafter and Framing solutions Circular: Arcs, Circumference, Segments and More Stairs - Set Riser Height and solve for Stairwell Opening Studs - Find number On-center for an entered Length Compound Miter Cuts Arched Rake-Walls Equal sided Polygons For Contractors, Architects, Engineers, Project Managers, Estimators, Draftspersons, Builders, Framers, Carpenters, Tradespersons Dimensional Math and Conversions Work in and convert between all building dimensional formats: Yards, Feet-Inch-Fractions, Decimal Feet and Inches and Metric - including Area and Volume D:M:S to Decimal Degree conversions Weight per Volume Full Trig Function: Sine, Cosine, Tangent, Arcsine, Arccosine and Arctangent simplify complex design and construction-math Built-In Time Saving Functions Complete Stair calculations for Risers, Treads, Stringer Length and Incline Angle Set Riser Height and solve for Stairwell Opening Built-in Right-Angle Functions Roof Function finds Area, Bundles, Squares and 4x8 Sheathing for Flat or Pitched Roofs Custom Rafter Function provides Common Rafters, Regular and Irregular Hips, Valleys and Jacks; instant Cutting Angles (Cheek, Level and Plumb) Jack Rafter results for Regular and Irregular Pitch Roof. Find Rake-Wall Studs with On-center spacing Compound Miter - Store Crown Angle and Enter Wall Corner Angle to calculate the Blade Tilt and Angle for Miter cuts Advanced solutions for Circles, Arches, Columns, Cones, Pillars, Windows and Post-holes Arched Rake-Walls with On-center Spacing Studs - Calculate the number of On-center Studs for an entered Length Equal Sided Polygon - Calculate Corner and Bi-sect Angles, Side Length, Perimeter and Area Board Feet Lumber estimating Additional Features User Preferences: Set custom defined options such as Fractional settings for 1/2" to 1/64" and Stair Headroom Height, Decimal Degrees and more Exponential Notation: Enter and display exponential values Backspace Key: Makes it easy to change just-entered values Constant Operator: Simplifies repetitive calculations Cost per Unit: Easily solve unit costing and pricing Accumulating Memory (M+) plus three additional Memory Storage locations "Paperless" Tape: Allows for review of last 20 entries; double-check totals Standard Calculations: Works as a math calculator with +, -, +/-, ×, ÷, %, π, 1/x, x2, and √ Automatic Shut-Off saves battery life Includes Rugged shock, dust and moisture-resistant Armadillo Gear case Pocket Reference Guides in English and Spanish Two LR44 long life batteries One-year warranty Tech Specs Size 5.7" x 3.0" x 0.65" (145 mm x 76 mm x 17 mm) Product Weight 4.6 oz (130 grams) Power Two 1.5-volt LR-44/A76 long-life batteries Display Type 11 Digits (7 normal, 4 Fractions) Display Dimensions 0.625" x 2.5" (16 mm x 63.5 mm) Accuracy 12 digit internal accuracy