SC-1 leaf porometer

stomatal conductance porometer measurements


  • stomatal conductance porometerStomatal conductance porometer manufactured by METER Group (formally Decagon Devices).
  • A low cost, easy-to-use, portable instrument for the measurement of stomatal conductance.
  • 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.
  • 1300+ citations of the stomatal conductance porometer in the scientific literature.


The SC-1 stomatal conductance porometer includes breakthrough steady-state technology. This makes getting accurate stomatal conductance measurements affordable and practical for everyday scientific research.

Plant water use is now easy to quantify with the SC-1 Leaf Porometer. Stomatal conductance porometer readings are recorded in about 30 seconds. Therefore, 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. The stomatal conductance porometer has been cited in over 1300 peer-reviewed scientific publications. The SC-1 Leaf Porometer has measured a wide range of plant species from wheat to Arabidopsis to woody trees and palms. 


the stomatal conductance porometer features

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


leaf measurements that are backed by science

The SC-1 Leaf Porometer is backed by solid scientific theory and 15 years of research. Consequently, the SC-1 stomatal conductance porometer is designed to provide you with a simple solution to a complex problem. By measuring vapor flux from the leaf through the stomates, the SC-1 can differentiate between healthy, transpiring leaves and those undergoing stomatal closure and stress. Hence, with high-speed results within 30 seconds, ease of use, and a low cost, the SC-1 Leaf Porometer means more measurements, higher replications, greater sample size, and better scientific outcomes.



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


stomatal conductance porometer video



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.

Jaskulska, I.; Jaskulski, D. 2021. Winter Wheat and Spring Barley Canopies under Strip-Till One-Pass Technology. Agronomy 11, 426. . Weblink.

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

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

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

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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