Makes it easy to do Linear, Area and Volume take-offs from blueprints and plans with speed, accuracy and confidence. Perfect for estimating, bidding or planning. 72 built-in Scales give you more versatility. 39 Imperial ( Feet-Inch) and 33 Metric. six User-Set "custom" scales. Perfect for scaling faxed or out of scale settings plans. Exclusive! built-in Memories. Quickly solve for Area and Volume. exclusive! Lock Switch. Protects scale settings from accidental changing. Built-in counter. Let's you count other items (i.e., studs, piers, outlets, etc.) Roll -in distances in either direction. Accepts dimensions as fast as you can accurately roll them - in either direction and with either hand. More dimensional units for maximum versatility. Select the most appropriate measurement units: Decimal, Feet, Feet-inches, Decimal Inches, Yards, Millimeters, Meters - including Square and Cubic formats. Large, easy-to-read LCD. Includes: Two Long-Life (CR-2430) Batteries, easy-to-follow User's guide, Protective Carrying Pouch and Full One-Year Limited Warranty.