At the estimating table or in the field, the Scale Master® Pro is an "all-in-one" take-off tool with architectural, engineering, map and metric blueprint scales built in. Plus, a custom set scale capability for working with plans that are out-of-scale. Reduce estimating errors and improve profits. Dedicated Functions:72 Built-In Scales; 39 Imperial (feet-inch) and 33 Metric. Perform Instant Linear, Rectangular Area and Volume Take-Offs; use it like a pen--just roll and measure. Calculate Rectangular Areas/Volumes (L x W x H). Roll and enter Length of room, then Width and instantly calculate Square Footage. Custom Scales. Convert between scales and dimensions. Includes: Handy Pocket Reference Guides. Hard Cover Protective Case. 2 Long-Life 3-Volt Batteries.