Accurate growth measurements made easy

The D1 Dendrometer is a simple tool that enables you to manually measure changes in the circumference of tree stems over time. It’s designed to be installed, left in place, and periodically visited to record changes in the circumference resulting from tree or stem growth. Designed for serious field research and forest management, it gives you a durable, low-maintenance way to monitor changes in trunk circumference over time—offering insight into growth patterns, stress response, and carbon storage.

The D1 was engineered with painstaking attention to detail by our team in Munich, Germany with features built for real-world reliability:

• Low-friction Astralon tape with minimal thermal expansion for consistent measurements, even in extreme weather. Friction is reduced by manufacturing the eyelets without burrs and eliminating printing on the bark-side surface of the tape. It wraps around the trunk of a tree and fastens with a spring mechanism that allows the tape to expand as the tree grows. Researchers can measure the change in diameter, typically at longer intervals (once a year).

• A uniquely engineered Vernier scale that makes readings precise and easy to interpret—no guessing, no recalculations.

• Pre-converted diameter readings for quicker field notes and less confusion later. The measurement scale is in units of π, so there is no need to convert circumference to diameter.

• Unbounded by size. The D1 measures trees with diameters from 10 to 66 cm. Two tapes can be connected to measure larger trunks. Stems less than 40 cm in diameter should use the short spring, and the longer spring should be used on stems greater than 40 cm in diameter.

• Built to last. Designed to stay in place and perform for years in woodland and forest environments.

Whether you’re documenting tree growth, studying ecosystem change, or supporting long-term carbon modeling, the D1 gives you clarity you can rely on—without the need for batteries, connectivity, or fragile tech.