Calculate and convert between Feet, Inches, Fractions, Decimal Feet, Decimal Inches, Board Feet, Yards, Miles, Kilometers, Meters, Centimeters, and Millimeters including square and cube of each. Dedicated fraction of an inch keys for direct entry with a single stroke. You can also calculate weights and liquid units, area, circumference and arc length of a circle. Paperless tape stores up to 20 entries. Construction keys for rafters and framing. Protective flip cover. One year limited warranty. 6 per pack.