Spencer 35' Chrome Clad Diameter Loggers Tape with Claw Hook, SP35DCRX
Diameter Tapes for Tree DBH Measurement
Diameter tapes (d-tapes) are the most precise field tool for measuring tree diameter at breast height (DBH) — a fundamental data point in timber cruising, growth studies, and forest inventory. CSP Forestry carries professional diameter tapes with both diameter and circumference scales, allowing foresters to directly read diameter from a circumference measurement without calculation. Available in steel and fiberglass, in metric and English graduations, our d-tapes are the standard equipment of timber cruisers and researchers across North America.
Complement your diameter tape with tree calipers for high-volume sampling, logger's diameter tapes for combined length and diameter measurement, and tallying supplies for efficient data recording. Browse our full forest measurement instruments catalog and carry everything in a well-organized cruiser vest.
Frequently Asked Questions
How does a diameter tape measure diameter?
A diameter tape is marked with a diameter scale (D = C/π) so that when wrapped around a tree's circumference, the tape directly reads the diameter — no calculation needed. This assumes the stem is approximately circular.
What length diameter tape should I buy?
Most foresters carry a 10-foot diameter tape, which accommodates trees up to about 38 inches DBH. For old growth or large hardwood stands, a longer tape may be needed. Check our full d-tape selection for available lengths.
Do you carry metric diameter tapes?
Yes. We carry diameter tapes in both English (inches/feet) and metric (centimeter diameter) graduations to support research and government programs that use SI units.
What other tree measurement tools complement a diameter tape?
A complete forest inventory kit includes diameter tapes, tree calipers, clinometers, angle gauges, increment borers, tally supplies, and a cruiser vest.
