• A Total of 72 Built-In Scales -- With 39 imperial (feet-inch) and 33 metric, there's a scale for almost any plan.
• Custom Scale --  Six (6) user-set custom scales. Perfect for scaling faxed or out-of-scale plans.
• Calibrates to any plan and then stores that scale for future use.
• Subtract & Counter -- Lets you subtract if you roll too far. And lets you count items (e.g., studs, outlets, etc.) & accumulate in memory.
• Two Built-in Memories ­ Solve for Area & Volume.  Store and recall individual L,W, & H values.  Or you can multiply and accumulate Linear, Area or Cubic values in these two useful Memories.

Both models include Auto Shut-Off, an easy-to-follow User's Guide, 2 long-life Lithium (CR-2430) Batteries, sturdy Vinyl Case, and a full 1-yYear Warranty.