SC-1 leaf porometer

stomatal conductance measurements


  • A low cost, easy-to-use, portable instrument for the measurement of stomatal conductance and plant water use
  • Simply clip the sensor head onto a leaf and record stomatal conductance within 30 seconds
  • Ideal for scientific research, as well as irrigation management for growers
  • Combine with the SF-4 Sap Flow Sensors for calibrated and continuous monitoring of stomatal conductance

The SC-1’s breakthrough steady-state technology makes getting accurate stomatal conductance measurements affordable and practical for everyday research.

Plant water use is now more than easier to measure with the SC-1 Leaf Porometer. Stomatal conductance readings are recorded in about 30 seconds. The SC-1 allows scientists and growers to gain greater insight into plant water relations and water use strategies.

Measurements from the SC-1 Leaf Porometer can be used in various fields of science including to estimate transpiration, Penman-Monteith evapotranspiration, hydrology models, irrigation scheduling, and more.


no moving parts

The SC-1’s steady state design means that it has no moving parts. It leaves the environment alone, and instead determines stomatal conductance by measuring the actual vapor flux from the leaf through the stomates and out to the environment.


lightweight, easy to carry

The porometer weighs about half a pound (300 g). You don’t have to haul it around the field with a neck strap; and if you get tired of carrying it, you can put it in your pocket.


save and download data

Readings can be displayed as either conductance or resistance and saved for downloading later (RS232 cable and download utility software included).


  • Plant water use and water balance.
  • Water stress measurements.
  • Uptake of herbicides, ozone and other pollutants.
  • Research on stomatal functions.


more details


continuous stomatal conductance measurements

Sap Flow MeterThe SC-1 Leaf Porometer can be combined with the SF-4 Sap Flow Sensors for continuous and uninterrupted measurements of stomatal conductance and leaf water use.

All porometers or leaf gas exchange chambers provide a “snap shot”, or spot measurement of stomatal conductance. The meters also need to be manually operated. While this is perfect where stomatal conductance across many leaves, samples, treatments or plots is required, it does not provide a convenient temporal data set.

Scientists at Edaphic Scientific have demonstrated how the SC-1 Leaf Porometer can be combined with the SF-4 Sap Flow Sensors for continuous measurements of stomatal conductance. The SC-1 Leaf Porometer can be used to calibrated a SF-4 Sap Flow Sensor which, in turn, can be installed on a small stem, or even a leaf’s petiole, for several days to weeks of continuous, uninterrupted measurements. By combining the SC-1 Leaf Porometer with the SF-4 Sap Flow Sensor, it is possible to have continuous stomatal conductance measurements at a time resolution of 5 minutes.

Click here for an example of how the SC-1 was used to calibrated a SF-4 Sap Flow Sensor.


example scientific publications

Bachofen et al 2017. No carbon “bet hedging” in pine seedlings under prolonged summer drought and elevated CO2. Journal of Ecology, doi: 10.1111/1365-2745.12822. Weblink.

Nolf et al 2016. Herb hydraulics: Inter- and intraspecific variation in three Ranunculus species. Plant Physiology, DOI: Weblink.

Scharenbroch et al. 2015. Tree species suitability to bioswales and impact on the urban water budget. Journal of Environmental Quality, 45, 199-206. Weblink.

Schoo et al 2016. Drought tolerance and water-use efficiency of giogas Crops: a comparison of cup plant, maize and lucerne-grass. Journal of Agronomy and Crop Science, 203, 117-130. Weblink.

Winkler et al 2016. Seasonal dry-down rates and high stress tolerance promote bamboo invasion above and below treeline. Plant Ecology, 217, 1219-1234.



feature specification
Accuracy 10% of measurement
Measurement Range 0 to 1000 mmol m-2s-1
Operating Environment 5 to 40°C, 0 to 100% RH, with desiccant chamber
Power Four "AA" batteries lasts approx. 3 years (battery drain in sleep mode < 50 μA) depending on use
Measurement Units mmol m-2s-1, m2/s mol-1, s/m
Data Storage 4095 measurements in flash memory
Computer Interface 9 pin serial RS232 interface
Aperture Diameter 6.35 mm
Sensor Head Cable Length 1.2 m
Dessicant Indicating DrieRite, 10-20 mesh
Measurement Time 30 s (in auto mode)

manual & docs

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