NTS Water Stress Meter

A photograph of the NTS Water Stress Meter being held in hand on white background

NTS Water Stress Meter

Regular price $51.50
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Infrared monitoring tool to identify plant water stress.

Varying irrigation techniques are required in different soil types. Weather conditions also influence water requirements – for example, hot, dry conditions, increase leaf transpiration and therefore increase water demands. It is essential to monitor plant moisture levels to determine if modifications to the watering program are required. The NTS Water Stress Meter is an invaluable, convenient tool to quickly determine if a crop is water stressed.


  • Lightweight and pocket sized.
  • Waterproof.
  • Replacement electrodes are available and easily fitted.
  • Easy to read LCD display.
  • Replacement 120 mL calibration solution available.
  • Range 0 – 0.1999 mS/cm.

  • Press the trigger to turn on the meter. Point the NTS Water Stress Meter directly at a white sheet of paper (from around 30 cm distance) and press the trigger to record the "ambient" temperature.
  • Repeat process to take the temperature of the plant leaf surface. Beam can be aimed at individual plants or into a full canopy. See Important section for required testing conditions.
  • Take multiple readings and then use these to calculate the average crop temperature.
  • Calculate the temperature differential between the ambient temperature and the crop temperature.
  • If a crop is water stressed, its temperature will be the same or higher than the ambient temperature.
  • If a crop has sufficient water, it should be cooler than the ambient temperature (due to evaporative cooling via transpiration).

  • Do not point the laser directly at the eye or indirectly off reflective surfaces.
  • Do not use near explosive gas, steam, or dust.
  • Store out of sunlight. Do not store on or near hot objects.

Please contact us for more information.

  • Plant leaf surface should be dry.
  • Take readings during peak sunlight hours, in low wind conditions.
  • If air temperature is much cooler than normal, water stress may not be reliably detected.
  • Keep the sun behind you when taking readings.
  • Avoid the beam measuring surrounding objects, e.g., soil, sky.
  • Do not test immediately after watering, as an inaccurate water stress level may be identified.

Online orders are only available within Australia. For international orders, please contact us.

Click here for detailed shipping information.

Any recommendations provided by Nutri-Tech Solutions Pty Ltd (NTS)
or its Distributors are advice only. As no control can be exercised over storage, handling, mixing, application or use, or weather, plant or soil conditions before, during or after application (all of which may affect the performance of our program), no responsibility for, or liability for any failure in performance, losses, damages, or injuries (consequential or otherwise), arising from such storage, mixing, application, or use will be accepted under any circumstances whatsoever. NTS recommend you contact an Agronomist prior to product application. The Buyer assumes all responsibility for the use of any NTS products.

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