Plant Transpiration Rate Meter
Measure transpiration rate, stomatal conductance, PAR, air & leaf temperature simultaneously.
Portable, field-ready, 7–9 hr battery, 2 GB SD storage.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- AGR-0035
- Sizing
- Model-specific dimensions confirmed from the selected configuration
- Ordering
- Quote-reviewed before fulfillment
- Category
- Agriculture & Food Science
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The Plant Transpiration Rate Meter measures the rate at which water vapor moves from a living plant—primarily through its leaves—into the surrounding atmosphere. In a single, simultaneous measurement session it captures air temperature, leaf temperature, air humidity, and photosynthetically active radiation (PAR), then calculates transpiration rate and stomatal conductance directly on the device. This multi-parameter approach gives researchers the full environmental context needed to interpret gas-exchange data accurately.
The instrument is built for field use: a compact, lightweight body supports one-person operation, a menu-driven display with cursor navigation shows test progress and results in real time, and a 4 V Li-ion battery sustains 7–9 hours of continuous work on a single charge. Measurements are stored to an onboard 2 GB SD card, making it straightforward to transfer data for downstream analysis.
Interchangeable leaf chambers—including a standard 55 mm × 20 mm chamber with custom sizes available—allow the meter to accommodate a wide variety of plant architectures, from broadleaf field crops and fruit trees to vegetables and grasses. This flexibility makes it equally suitable for controlled agronomic trials and open-field ecological surveys.
Researchers comparing portable transpiration meters typically weigh sensor accuracy, the breadth of simultaneously logged parameters, and chamber adaptability against their specific crop or vegetation type. This meter addresses all three criteria, offering calibrated digital sensors for temperature and humidity alongside a silicon photocell PAR sensor, within a single portable platform.
Air Temperature (T_air) Range
- 0–50 °C
Air Temperature Resolution
- 0.1 °C
Air Temperature Error
- ±0.2 °C
Leaf Temperature (T_leaf) Sensor Type
- Platinum
Leaf Temperature Range
- 0–50 °C
Relative Humidity Range
- 0–100 %
Relative Humidity Resolution
- 0.1 %
Relative Humidity Error
- ≤ ±3 %
PAR Sensor Type
- Silicon photocell with correction filter
PAR Range
- 0–2500 µmol m⁻² s⁻¹
PAR Accuracy
- < 5 µmol m⁻² s⁻¹
Flow Measurement
- Glass rotameter
Standard Leaf Chamber Size
- 55 mm × 20 mm (custom sizes available)
Operating Temperature
- 20–50 °C
Operating Relative Humidity
- 0–100 % (non-condensing)
Power Source
- 4 V Li-ion battery
Battery Life
- 7–9 hours continuous operation
Data Storage
- 2 GB SD card
Display
- 320 × 160 dot-matrix
What parameters does the meter measure simultaneously?
In a single measurement session the meter records air temperature (0–50 °C), leaf temperature (0–50 °C), air relative humidity (0–100 %), and PAR (0–2500 µmol m⁻² s⁻¹), then uses those values to calculate transpiration rate and stomatal conductance automatically.
What types of crops and vegetation can it be used with?
The meter supports field crops, fruit trees, vegetables, grasses, and other plant types. Different leaf chamber sizes—including a standard 55 mm × 20 mm chamber—accommodate leaves of varying shapes, and custom chamber dimensions are available for non-standard specimens.
How long does the battery last and how is data stored?
The built-in 4 V Li-ion battery supports 7–9 hours of continuous operation. Measurement data are saved to a 2 GB SD card included with the unit, allowing easy transfer to a computer for further analysis.
What are the accuracy specifications for the key sensors?
The air temperature sensor has a resolution of 0.1 °C and an error of ±0.2 °C. The relative humidity sensor has a resolution of 0.1 % and an error of ≤ ±3 %. The PAR sensor (silicon photocell with correction filter) has an accuracy of < 5 µmol m⁻² s⁻¹.
What environmental conditions are required for reliable operation?
The meter is designed to operate in ambient temperatures of 20–50 °C and relative humidity of 0–100 %, provided there is no condensation of moisture on the sensors or leaf chamber.
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