Overview:
DBH (diameter at breast height) is the diameter of a tree trunk measured at 1.3 m above ground level. The DJ-310X series is an extremely simple yet precise tool for tracking changes in tree DBH over time.
Key Features：
- The scale is clear and easy to read due to the laser etching process. Even after long-term use, the scale will not disappear.
- Stainless-steel construction; no rust in harsh environments.
- Scale graduated directly in π-units, allowing instantaneous reading of both diameter and diameter increment.
- Using springs as the fixation device, no harm to the trees and enables long-term monitoring without any damage.
- The cursor scale and the main scale are integrated on the same plane, with the cursor scale positioned below the main scale. This design minimizes the overall size, making it convenient and quick to read the values.
Technical Specifications
Minimum measurable girth: 5π cm
DBH ranges (other sizes available on request):
DJ-3101: 5–12 cm
DJ-3102: 10–22 cm
DJ-3103: 20–42 cm
DJ-3104: 40–65 cm
Resolution: 0.01π cm
Spring mounting holes are spaced at 3.14 centimeters.
Main rule material: SUS304 stainless steel
Spring material: SUS304 high-tension spring
Buckle length: 1 cm
Initial tension: 259.29 g
Spring constant: 32.01 g /mm
Transverse elastic modulus: 7 000 kg /mm
Operating temperature: –40 °C to +70 °C
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