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TPQK-1000 Plant Leaf Porometer

Measurement:air temperature,air humidity,flow rate,atmospheric pressure
Calculation:transpiration rate, stomatal conductance and stomatal impedance.
Humidity range:0-100% RH
  • TPQK-1000

  • NADE

  • 1

  • 1 year

  • China

Product Description

Stoma is the main outlet of water vapor from the internal to the external during transpiration, and also the channel for photosynthesis and respiration to exchange gas with the outside, thus affecting the processes of transpiration, photosynthesis and respiration. The closing and opening of stoma are controlled by guard cells. The wall thickness of guard cells is different, and cellulose microfibrils are connected with the cell wall, which leads to stomatal opening. When guard cells swelled with water, the thinner outer wall was easy to elongate and expand outward, but microfibrils were difficult to elongate, so stoma opened and transpiration was strengthened. Stoma control the entry and exit of carbon dioxide, so it is related to photosynthesis and respiration. Therefore, the measurement of transpiration rate and stomatal conductance is of great significance to agricultural research, teaching, horticulture research and forestry research.



air temperature,air humidity,flow rate,atmospheric pressure, PAR, leaf temperature,leaf humidity.


transpiration rate, stomatal conductance and stomatal impedance.


air temperature, air humidity, gas flow, leaf temperature, leaf humidity, atmospheric pressure, PAR, transpiration rate, stomatal conductance, stomatal resistance.


open circuit measurement, closed circuit measurement;

closed circuit measurement mode can choose automatic measurement and manual measurement.

Storage capacity

more than 150000 groups, SD card data storage.

Portable function

portable, with rechargeable battery, can be used in field.


range: 0-100% RH;

automatic temperature correction;

resolution: 0.1%;

error: ≤± 1.8% RH;

response time: 15s.

Optical quantum

range: 0-3000 μ mol / m2s1;

spectrum: 400-700nm, visible light range;

resolution: 1 μ mol / m2s1;

error: ± 2%.

leaf temperature

range: 0-50 ℃;

resolution: ≤ 0.1 ℃;

error: ≤ ± 0.2 ℃

Air temperature

range: 0-50 ℃;

resolution: 0.1 ℃;

error: ± 0.3 ℃.


range: 0.3-1.0L/min;

resolution: 0.01L/min;

error: ± 2.0%.

Power supply

7.4v 10Ah rechargeable lithium battery with 10 hours service life.

Real photos show

TPQK-1000 (5).jpg  TPQK-1000 (6).jpg