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Enabling better global research outcomes in soil, plant & environmental monitoring.


The SNiP-SPW1 is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time plant diameter measurements in relation to real-time weather parameters and soil water potential for continuous plant monitoring.


The base SNiP-SPW1 integrates 1x S-NODE and three sensors to a site’s unique network, communication and power requirements: 1x DBS60 Band Dendrometer, 1x Atmos-14, 1x TEROS-21.

The DBS60 Band Dendrometer is an SDI-12 Band Dendrometer designed to measure short- and long-term changes in stem circumference.

The Atmos-14 monitors microclimate and evapotranspiration via the measurement of Relative Humidity, Barometric Pressure, Air Temperature, and Vapor Pressure with or without a passive radiation shield.

The TEROS-21 uses solid ceramics which have a wide range of pore sizes that can typically measure soil water potential of -100kPa and drier. Solid ceramics are suited to general monitoring of soil suction within or under structures of buildings, roadways and mine sites.


See Further Specifications on the S-NODE

See Further Specifications on the DBS60 Band Dendrometer
See Further Specifications on the ATMOS-14
See Further Specifications on the TEROS-12

Further parameters can be added to the SNiP, without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application. The S-NODE can support 1x additional SDI-12 sensor to the base package.


The S-NODE (for Environmental Monitoring) has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source).

A decoder suitable for TTN will be provided based upon sensor configuration.

  • LoRaWAN™ low-power long-range connectivity
  • Supports the full range of SDI-12 commands, and sensors requiring constant excitation.
  • Optional CAT-M1
  • Solar rechargeable Lithium-ion or external 12V power options
  • Optional Multi-constellation GNSS
  • AS923, AU915 and US915 available, with other region plans available upon request.
  • Standard IP65 enclosure, optional IP67


DBS60 Band Dendrometer

The DBS60 is an SDI-12 Band Dendrometer designed to measure short- and long-term changes in stem circumference.

The DBS60 SDI-12 Band Dendrometer is similar to the DBL60, but has a cable for the connection to a SDI-12 Data Logger.

Change in Tree Circumference (mm)
Temperature (°C)


Increment sensors type
rotary position
Range 64 mm of circumference
2% of full scale
Tape strength
15 to 20 N in the whole range, stem diameter independent
Tape temperature coefficient:
17.3 x 10-6 per °C
Operating range:
   – Temperature
-30 to 60°C
   – Humidity 0 to 100%
Size 100 x 70 x 100 mm
ca 260 g
Minimal stem diameter
8 cm
Increment range
Tightening strength 15 to 20 N



(Note: The Decagon VP-4 has been replaced by the Meter ATMOS 14).

  • Microclimate measurement made simple
    If you’re doing a microclimate or evapotranspiration study, you may need up to four extra sensors to get important measurements that will benchmark your data. Not to mention you have to face the hassle of getting all those sensors integrated into your system. What you need is something simpler. With this in mind, we engineered the ATMOS 14 to be four sensors in one—air temperature, relative humidity, barometric pressure, and vapour pressure.
  • With the ATMOS 14, all your bases are covered
    Thousands of engineers and ecologists already depend on the ATMOS 14 for straightforward measurements. Whether you’re using the EM60G to look at plant emergence, leaf area index, or fractional interception, there isn’t an easier way to benchmark your data. The ATMOS 14 is a versatile, low-maintenance, and fast sensor designed to make taking temp/RH measurements simpler and therefore less work.
  • Plug it in, and walk away
    Despite its minimalist design, the ATMOS 14 provides maximum value. While other sensors require wiring and programming, the ATMOS 14 simply plugs into the EM60G (It’s also compatible with third-party data loggers). There’s no having to figure out complicated instructions. Just mount the sensor on your data logger mast, plug it in, and walk away.
  • Measures a lot. Requires very little effort.
    The ATMOS 14 is low-maintenance. It gives accurate vapour pressure and RH without a lot of cleaning. Plus it’s weatherproof, meaning it will last a long time in the field. Another helpful feature is the compact shape that fits into tight spaces, leaving room on a mast for other sensors.
  • Readings don’t get any more rapid
    Because the ATMOS 14 is plug and play, setup is quick. And responses are equally fast. Thanks to a Teflon protection screen that keeps liquid water out, but vapour moving freely through, it responds rapidly while keeping dust and liquid water off the sensor. Both features add up to time saved on your part.
  • For everything it measures, there’s not much to it
    With ATMOS 14, all your basic microclimate measurements are covered using a small, simple integrated sensor. This versatile, low-maintenance sensor will rapidly and reliably measure air temperature, relative humidity, barometric pressure, and vapour pressure, making benchmarking quick and hassle-free.
RANGE 0 to 100% RH
ACCURACY Sensor measurement accuracy is variable across a range of temperatures.
Refer to the chart in Figure 1 to determine the accuracy specification for the ATMOS 14 sensor.
(τ, 63%):
< 40 s (response time in 1 m/s air stream)
HYSTERESIS < 1% RH typical
LONG TERM DRIFT < 0.5% RH/year typical
RANGE -40°C to 80°C
ACCURACY Sensor measurement accuracy is variable across a range of temperatures. Refer to the chart in Figure 2 to determine the accuracy specification for the VP-4 sensor
(Τ, 63%)
< 400 s (response time in 1 m/s air stream)
LONG TERM DRIFT < 0.04°C / year typical
RANGE 0 to 47 kPa
ACCURACY Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 3 to determine the accuracy specification for the VP-4 sensor.
RANGE 49 to 109 kPa
DIMENSIONS 1.96 cm (dia) x 5.4 cm (h)
POWER REQUIREMENTS 3.6 to 15 VDC, 0.03 mA quiescent, 4 mA during 300 ms measurement
OUTPUT Decagon Digital or SDI-12
CONNECTOR TYPES 3.5 mm (stereo) plug or stripped and tinned lead wires (pigtail)
CABLE LENGTH 5 m standard; custom cable length available upon request
Meter/Decagon: Em50 Series (Firmware 2.19+)
ICT SDI-12 logger, AML, AWS, Universal Telemetry Hub
Campbell Scientific: Any logger with serial I/O
DataTrac (rev 3.11+)

VP4 Humidity Acc

VP4 VP Acc

Temperature Acc VP4


Decagon (METER Group) TEROS-12

Volumetric water content (VWC)
Range: Mineral soil calibration: 0.00–0.62 m3/m3
Soilless media calibration: 0.0–1.0 m3/m3
Apparent dielectric permittivity (εa): 1 (air) to 80 (water)
NOTE: The VWC range is dependent on the media the sensor is calibrated to. A custom calibration will accommodate the necessary ranges for most substrates.
Resolution: 0.001 m3/m3
Accuracy: Generic calibration: ±0.03 m3/m3 (±3.00% VWC) typical in mineral soils that have solution EC <8 dS/m
Medium specific calibration: ±0.01–0.02 m3/m3 (±1–2% VWC) in any porous medium
Apparent dielectric permittivity (εa): 1–40 (soil range) , ±1 εa (unitless) 40–80, 15% of measurement
Dielectric measurement frequency 70 MHz
Range: −40 to 60°C
Resolution: 0.1°C
Accuracy: ±1°C
Bulk electrical conductivity (ECb)
Range: 0–10 dS/m (bulk)
Resolution: 0.001 dS/m
Accuracy: ±5% of measurement
Output DDI serial or SDI-12 communications protocol
Data logger compatibility Any data acquisition system capable of 4.0- to 15-VDC power and serial or SDI-12 communication (see compatibility chart)
Measurement volume 1010 mL
Dimensions Length: 9.4 cm (3.70 in)
Width: 2.4 cm (0.95 in)
Height: 7.5 cm (2.95 in)
Probe length 5.5 cm (2.17 in)
Operating temperature range Minimum: –40°C
Typical: NA
Maximum: 60°C
NOTE: Sensors may be used at higher temperatures under certain conditions; Contact Customer Support for assistance
Cable length 5 m (standard)
75 m (maximum custom cable length)
NOTE: Contact Customer Support if a nonstandard cable length is needed
Connector types 3.5-mm stereo plug connector or stripped and tinned wires
Supply voltage (VCC) to GND Minimum: 4.0 VDC
Typical: NA
Maximum: 15.0 VDC
Digital input voltage (logic high) Minimum: 2.8 V
Typical: 3.6 V
Maximum: 3.9 V
Digital input voltage (logic low) Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Power line slew rate Minimum: 1.0 V/ms
Typical: NA
Maximum: NA
Current drain (during 25-ms measurement) Minimum: 3.0 mA
Typical: 3.6 mA
Maximum: 16.0 mA
Current drain (while asleep) Minimum: NA
Typical: 0.03 mA
Maximum: NA
Power up time (DDI serial) Minimum: 80 ms
Typical: NA
Maximum: 100 ms
Power up time (SDI-12) Minimum: NA
Typical: 245 ms
Maximum: NA
Measurement duration Minimum: 25 ms
Typical: NA
Maximum: 50 ms
COMPLIANCE Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
2014/30/EU and 2011/65/EU
EN61326-1:2013 and EN55022/CISPR 22