Two in one: the official Construction Master Pro from Calculated Industries for your iPhone and iPad includes two models: #4065 and #4080 (CM Pro with Trig). And while perhaps obvious, if you change from an iOS device to a non-iOS device, you WILL need to buy a new license as they are incompatible.Advanced Feet-Inch-Fraction Construction-Math Calculator by Calculated Industries, built with the same features and functions, and with the same core engine that powers the industry-standard advanced construction-math calculators from Calculated Industries. Youll actually get two apps in one, since the Construction Master Pro for iPhone has all the functionality of the Construction Master Pro and the Construction Master Pro Trig - and includes a full Users Guide built in, as well as the ability to press and hold a key for specific help!Ideal for Architects, Builders, Contractors, Designers, Draftspersons, Engineers, Framers/Carpenters and TradesmenNeed to quickly and accurately solve a construction problem when meeting with a client? Left your calculator in the truck? Just pull out your iPhone or iPad, tap on the Construction Master Pro icon, and youll have an answer in seconds! You get ALL of the functionality of the handheld Construction Master Pro and Construction Master Pro Trig calculators in one powerful, easy-to-use app. Solve tough construction-math problems and reduce errors on the jobsite or in the office. Reduce costly errors and save time and money. It will help you and your crew on every phase of your projectsestimating, bidding and building.FEATURES: Created by Calculated Industries, the originator of the award-winning Construction Master calculators All the functionality and solutions of the handheld Construction Master calculators and optimized for the iPhone/iPod Touch user Entry Editing Backspace Key with a swipe of a finger (left - to - right) A complete Users Guide in English or Spanish is available free at www.calculated.com Full trigonometric function: sine, cosine, tangent, arcsine, arccosine and arctangent Powerful built-in solutions make it ideal for completing layouts, plans, bids and estimates Work in and convert between all building dimensional formats: feet-inch-fractions, inch fraction, yards, decimal feet (10ths, 100ths), decimal inches and metric (m, cm, mm) Built-in right angle functions simplify square-ups, rafters, slopes and moreBUILT-IN SOLUTIONS:Dimensional Math and Conversions Feet-Inch-Fraction, Inch Fraction, Yards Decimal Feet (10ths, 100ths), Decimal Inches Preset Fractions (1/2" through 1/64") D:M:S, Decimal Degree Entry and Conversions Full Metric Function (m, cm, mm) Right Angle Solutions Complete Right Angle/Rafter Calculations Pitch Key (Slope and Grade) Rise, Run, Diagonal/Common Rafters Hip/Valley Key Jack Rafters Key Irregular Hip/Valley and Jacks Rafter Cutting Angles (Plumb, Cheek and Level Cuts) Stair Layout Key Stair (Advanced Riser Limit, Stairwell Opening, Headroom, Floor Thickness) Diagonal Key Expanded Rake-Wall Arched Rake-Wall Area and Volume Solutions Square and Cubic Roof Bundles, Squares, 4x8 Sheets, Pitch, Plan Area Drywall, Siding and Paneling 4x8, 4x9 and 4x12 Column/Cone Area and Volume Basic Circular Calculations Advanced Circular Calculations Weight per Volume Conversions Length, Width and Height Keys Blocks, Footings Special Functions Trigonometric Function Keys: Sine, Cosine, Tangent, Arcsine, Arccosine, Arctangent Board Feet Studs: Find number On-center User-Definable Preferences Cost per Unit (total costs based on unit price) Equal-Sided Polygon Compound Miters Crown Angle Paperless Tape 4 MemoriesTRADEMARKS:Construction Master is a registered trademark of Calculated Industries, Inc.