Measure the Whole Range!

Point dendrometer ZN12-O-WP

Point dendrometers are high-precision measuring instruments with which changes in diameter (trunk, branches, roots) in the micrometer range (μm) can be recorded in a temporal resolution of minutes. This means that Transpiration-related changes in day-night diameters as well as the irreversible secondary thickness growth induced by new cell formation in the xylem and phloem over the course of the season can be measured. In general, plant-water relationships and growth rates can be quantified depending on (changing) climatic conditions. The point dendrometers generally consist of an O- or T-shaped (carbon) frame including anchoring system, depending on the diameter, as well as a sensor, the sensor head of which is pressed lightly against the surface of the measured object by a spring.All parts of such measuring devices are more or less sensitive to temperature. The absolute temperature sensitivity of the point dendrometer is <0.5 µm per ° C.The point dendrometers are powered by a 3 to 5 V DC power source and are compatible with almost all types of data loggers on the market.


The ZN12-O-WP is a point dendrometer with a ring-shaped frame, which is offered in different sizes to cover a wide range of small diameters (of trunks, branches, roots) from 1 - 8 cm.
The available diameters are:

  • 100 mm (ZN12-O100),
  • 80 mm (ZN12-O80),
  • 60 mm (ZN12-O60).



    • No disturbances induced by temperature and humidity caused by deformation of the outermost layer of bark that is not living
    • Components that are insensitive to temperature enable high-precision measurements in the μm range
    • No influence of the measuring range by the anchoring system
    • Easy to assemble
    • Very robust and weatherproof material

    Technical Specifications

    Scope of application:Moisture but not extremely wet locations
    Diameter (measuring range):1 - 8 cm (trunks, branches, roots)
    Maximum measurement: 2 cm (increase) (max. Stroke of the movable rod)
    Power supply:5V DC
    Output:0-5 V DC, single ended (mass-related) measurement
    Voltage sensitivity:1 mV = 4,0 μm
    Temperature sensitivity:<-0,28 μm/ ° C-1
    Carbon frame:O- or ring-shaped
    Frame size:3 sizes for optimal use up to 8 cm (60, 80, 100 mm)
    Weight:120 - 160 g (without threaded rods)




    Ordering Details:

    Art.-Nr.:  170202Dendrometer ZN12-O60-WP (diameter 60 cm)
    Art.-Nr.:  170203Dendrometer ZN12-O80-WP (diameter 80 cm)
    Art.-Nr.:  170205Dendrometer ZN12-O100-WP (diameter 100 cm)



    Principal Office Müncheberg

    Umwelt-Geräte-Technik GmbH
    Eberswalder Str. 58
    15374 Müncheberg
    Tel.: +49 (0) 33432 7559-0

    Branch South

    Umwelt-Geräte-Technik GmbH
    Munich Airport Business Park
    Lindberghstr. 7a
    85399 Hallbergmoos
    Tel.: +49 (0) 811 124478-0