Plant Porometer
Measure transpiration rate and stomatal conductance in the field or lab.
10-hour battery life, 150,000+ data group storage. Ideal for crop, horticulture, and forestry research.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Measured Parameters
- Air temperature, air humidity, flow rate, atmospheric pressure, PAR, leaf temperature, leaf humidity
- Derived Measurements
- Transpiration rate, stomatal conductance, stomatal resistance
- Measurement Modes
- Open circuit or closed circuit; closed circuit mode offers automatic or manual measurement
- Humidity Sensor
- Range 0 to 100% RH; resolution 0.1%; error ≤ ±1.8% RH; response time 15 s; automatic temperature correction
- PAR Sensor
- Range 0 to 3000 µmol m⁻² s⁻¹; spectrum 400 to 700 nm; resolution 1 µmol m⁻² s⁻¹; error ±2%
- Leaf Temperature Sensor
- Range 0 to 50 °C; resolution ≤ 0.1 °C; error ≤ ±0.2 °C
The TPQK-1000 Plant Porometer is a field and laboratory instrument designed to measure transpiration rate and stomatal conductance in plant leaves. It works by sensing air temperature, air humidity, flow rate, atmospheric pressure, PAR, leaf temperature, and leaf humidity, combining these readings to characterize how freely a leaf exchanges water vapor with its surroundings — the core physiological metric that links plant water status to productivity.
Stomatal conductance is the key parameter researchers compare across treatments, species, growth stages, and environmental conditions. Because stomata regulate both water loss and CO₂ uptake, accurate conductance data underpins studies in drought tolerance, irrigation scheduling, canopy modeling, and breeding selection, making the TPQK-1000 relevant from controlled-environment growth chambers to open field plots.
The instrument is built for extended measurement campaigns. An onboard rechargeable lithium battery (7.4 V, 10 Ah) delivers up to 10 hours of continuous operation per charge, and an SD card stores more than 150,000 data groups — enough capacity to log entire field seasons without offloading data at the end of every day.
Typical applications include agricultural crop physiology, horticultural variety trials, forestry canopy assessments, and undergraduate or postgraduate plant-science teaching programs where hands-on stomatal measurement is part of the curriculum.
Measured Parameters
- Air temperature, air humidity, flow rate, atmospheric pressure, PAR, leaf temperature, leaf humidity
Derived Measurements
- Transpiration rate, stomatal conductance, stomatal resistance
Measurement Modes
- Open circuit or closed circuit; closed circuit mode offers automatic or manual measurement
Humidity Sensor
- Range 0 to 100% RH; resolution 0.1%; error ≤ ±1.8% RH; response time 15 s; automatic temperature correction
PAR Sensor
- Range 0 to 3000 µmol m⁻² s⁻¹; spectrum 400 to 700 nm; resolution 1 µmol m⁻² s⁻¹; error ±2%
Leaf Temperature Sensor
- Range 0 to 50 °C; resolution ≤ 0.1 °C; error ≤ ±0.2 °C
Air Temperature Sensor
- Range 0 to 50 °C; resolution 0.1 °C; error ±0.3 °C
Flowmeter
- Range 0.3 to 1.0 L/min; resolution 0.01 L/min; error ±2.0%
Data Storage Capacity
- More than 150,000 data groups on an SD card
Power Supply
- 7.4 V, 10 Ah rechargeable lithium battery
Battery Service Life
- Up to 10 hours per charge
What physical parameters does the TPQK-1000 measure?
The porometer measures air temperature, air humidity, flow rate, atmospheric pressure, PAR, leaf temperature, and leaf humidity, and calculates transpiration rate, stomatal conductance, and stomatal resistance for the leaf being sampled.
How long can I use the instrument in the field before recharging?
The built-in 7.4 V, 10 Ah rechargeable lithium battery provides up to 10 hours of service life per charge, supporting a full day of continuous field measurements.
How much data can the TPQK-1000 store?
The instrument stores more than 150,000 data groups on an SD card, so you can log large numbers of readings across multiple field days without needing to offload data between sessions.
What types of research is this porometer suited for?
The TPQK-1000 is well suited to agricultural research, horticultural variety trials, forestry canopy studies, and teaching applications where students and researchers need reliable stomatal conductance and transpiration rate measurements.
Is the battery replaceable or rechargeable?
The TPQK-1000 uses a rechargeable lithium battery (7.4 V, 10 Ah). It is designed to be recharged between sessions rather than swapped out in the field.
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