temperature & humidity

VP-4 / ATMOS-14 digital sensor


Continuously monitor temperature, relative humidity, vapour pressure deficit (VPD) and barometric, all in one sensor, with the VP-4, also known as the ATMOS-14.

The VP-4 is a digital, SDI-12 sensor that is compatible with our range of diverse data logging solutions or connect the sensor to your existing data logging system.

The VP-4 can be inserted into a radiation shield for accurate meteorological and weather measurements.

The sensor is delivered pre-calibrated and ready to install.


  • Low cost, high accuracy
  • IP65-rated environmental protection
  • Radiation shields with natural or forced ventilation
  • Compact, weather proof design


the grape monitor

In 2017, the New South Wales Department of Primary Industries commissioned Edaphic Scientific to install a phyto-monitoring system on various varieties of grapevines.

Known as The Grape Monitor, the phyto-systems are measuring stem growth (dendrometers), sap flow, soil moisture, canopy temperature, and more parameters.

Data is uploaded to the internet via the Edaphic Scientific telemetry system. These data can be viewed at anytime.

For more information, visit The Grape Monitor.


whole system monitoring solutions

Edaphic Scientific is a one-stop shop for a whole system monitoring solution. We provide plant and soil monitoring systems for researchers and growers.

Our systems not only support dendrometers, but related sensors such as sap flow, soil moisture, weather parameters, and more.

At Edaphic Scientific we want to work with you from the start of your project through to its completion. We can provide:

  • Assistance with project and experimental design
  • Procurement of all monitoring equipment, including sensors, data loggers and data management software. Edaphic Scientific is a one-stop shop where we can source and find any necessary equipment for your project from our preferred suppliers or third party suppliers
  • Installation and training
  • On-going assistance with data interpretation and equipment maintenance
  • Data correction and analysis, including statistical analysis with the R-package
  • Report and publication preparation including tables, figures, graphs, and manuscript writing


advanced data collection and management solutions

DMS IPhoneEdaphic Scientific recognises the need for flexible and adaptable sensor and data logging solutions for experimental or environmental monitoring projects.

Data can be downloaded directly in the field from data loggers. A direct connection between the data loggers and your computer, via a USB cable, can be used for manual downloading of data.

Alternatively, data can be downloaded over the internet on your iPhone, iPad or desktop computer with the Eagle.io cloud-based, data management software solutions. Through this remote based downloading capabilities, you can download, view and manage your data, and system, anywhere in the world and at anytime.



feature specification
relative humidity
Measurement Range 0 to 100% RH
Measurement Accuracy Temperature and RH dependent | 2 to 5 %
Response Time (τ, 63%): < 40 s
Hysteresis < 1% RH typical
Signal Drift < 0.5% RH/year typical
Measurement Range -40 °C to 80 °C
Measurement Resolution 0.1 °C
Measurement Accuracy 0.5 °C
Response Time < 400 s
Signal Drift < 0.04 °C / year typical
vapour pressure deficit (VPD)
Measurement Resolution 0.01 kPa
Measurement Accuracy 0.07 kPa at 20 °C
barometric pressure
Measurement Range 49 to 109 kPa
Measurement Resolution 0.01 kPa
Measurement Accuracy 0.4 kPa
general specifications
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
Response Time 300 ms
Output SDI-12
Operating Temperature -40 °C to 80 °C
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
Data Logger Compatibility Any SDI-12 enabled data logger

manual & docs

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