SKU: 56955323673
watermark soil moisture meter

watermark soil moisture meter Soil moisture tension sensor (Watermark)

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Description

watermark soil moisture meter Soil moisture tension sensor (Watermark)Product info This soil moisture tension sensor consists of three Watermark sensors, an NTC temperature sensor and a Crodeon Watermark adapter with M12 cable. This combination allows you to measure soil moisture at different heights or in different locations for increased accuracy. The Watermark adapter by Crodeon is a small electronic sensor adapter that reads and calibrates three Watermark sensors with an NTC soil temperature sensor using the formula

Product info

This soil moisture tension sensor consists of three Watermark sensors, an NTC temperature sensor and a Crodeon Watermark adapter with M12 cable. This combination allows you to measure soil moisture at different heights or in different locations for increased accuracy.

The Watermark adapter by Crodeon is a small electronic sensor adapter that reads and calibrates three Watermark sensors with an NTC soil temperature sensor using the formula developed by Dr. Clinton C. Shock in 1998.

The Watermark adapter uses high quality pseudo-AC excitation as specified by the manufacturer Irrometer (source: www.irrometer.com/200ss.html) to extend the life of the sensor and optimize the accuracy of the readings.

The readings of the Watermark are expressed in kilopascals. A higher reading means the soil is dry and plants therefore have to make more effort to extract water from the soil. Use the following readings as a general guideline:

  • 0-10 kPa: Saturated soil
  • 10-30 kPa: Soil is adequately wet (except coarse sands, which are beginning to lose water)
  • 30-60 kPa: Usual range for irrigation (most soils)
  • 60-100 kPa: Usual range for irrigation in heavy clay
  • 100-200 kPa: Soil is becoming dangerously dry for maximum production. Proceed with caution!

Reporter reads the calibrated soil moisture and soil temperature values in real-time using a waterproof M12 cable. This means only one connector on your Reporter is used to read 3 Watermarks and 1 soil temperature sensor.

The M12 cable can be extended up to 30m using M12 extension cords. Multiple Watermark adapters can be plugged into one Reporter or combined with other sensors in our shop. The Watermark adapter is designed for low power consumption so it can perfectly work with your solar powered Reporter.

Patented Watermark sensor

Over the last four decades, the Watermark soil moisture tension sensor has been the preferred choice of growers, irrigation experts and researchers alike for providing the most affordable, simple and reliable measurement of available soil water.

The Watermark soil moisture sensor acts as an artificial root, exchanging water with the surrounding soil as a plant does. This exchange enables measurement of how much effort (suction or soil water tension) is required by a plant to extract water that is available from the soil, not just what the moisture percentage of the soil may be. Measuring this soil water tension provides reliable data for irrigation scheduling, without requiring complicated calibrations for individual sites and different soils.

Comparing the Watermark sensor to the SM100

Both the SMT100 and the Watermark sensor measure soil moisture. However, there are some differences that we can point out. The SMT100 measures the soil moisture content as a percentage of the soil volume, whereas the Watermark sensor actually measures how much effort is required by a plant to extract water that is available from the soil.

For a full comparison between these sensors, read our blog post on this topic.

Installation

Before installing the sensors, make sure to follow this procedure in order to improve the sensor response in the first few irrigations.

Soak the sensors overnight in irrigation water. Always install a wet sensor. If time permits, slowly wet the sensor by partially submerging (no more than half way) for 30 minutes in the morning and let dry until evening, wet for 30 minutes, let dry overnight, wet again for 30 minutes the next morning and let dry until evening. Soak over the next night and install wet. This will improve the sensor response in the first few irrigations. 

If the Watermark sensors are mounted on a pvc pipe, make sure the hole you're drilling in the ground has the same diameter as the pipe (not larger).

Crodeon Cloud

All measurement data is streamed to the Crodeon Dashboard in realtime. These measurement logs can be viewed live or historical data can be exported for more detailed reports. 

The Dashboard is also the place to change alarm settings or other Reporter settings like measurement interval.

Soil moisture tension sensor with API

Reporter comes with a rest API that you can connect to your own systems and software for easy data integration. For example, to automate a sprinkler system for when the sensor detects lack of moisture in the soil.

Physical properties

For more detailed instructions about using and maintaining the Watermark sensor, please refer to the documentation from the manufacturer: Download manual.

Weight (adapter) 95 g
Width (adapter) 105 mm
Height (adapter) 40 mm
Depth (adapter) 70 mm
Cable length (M12) 5 m
Cable length (Watermarks) 2 m
Cable length (NTC temp.) 3 m
Shipping Notes
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Exchange/Return Notes
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SKU: 56955323673

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Sarah Kendziorski
Fort Morgan, US
★★★★★ 3
Nice balls but arrived with a bad chemical smell
Color: 12 Tennis Ball
Wonderful Product!!! The balls themselves are amazing and the squeaker in them my dog loves. I am giving them only a three star because they arrived and they SMELL like chemicals so bad!!! I was afraid to give it to my dog so i washed one out and put it up hoping the chemical smell will go away. This not good for a dog as unknown chemicals can make them really sick. Whatever amazon is spraying on their stuff it's not good
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Reviewed in the United States on April 1, 2025
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Brandi G
Boise, US
★★★★★ 5
Puppy tested & approved
Color: 12 Tennis Ball
I ordered these squeaky tennis balls for my cocker spaniel. She absolutely loves these tennis balls with the squeakers in them! She plays with them all day, and chews on them frequently. We have not had any problems with her, breaking the tennis balls, which is generally the issue we have with her. The tennis ball fuzz stays on the ball very well, which is usually an issue with standard tennis balls, because my dog likes to peel off the yellow fuzz on all tennis balls. She has not been able to do that with these. I will definitely be buying these again , but will not need to anytime soon as these are extremely well built.
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Reviewed in the United States on October 25, 2022
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Kindle Customer
Whiting, US
★★★★★ 5
My dogs love these things
Color: 12 Tennis Ball
My dogs love these things. I think I bought it twice now.
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Reviewed in the United States on January 15, 2026
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Ken
Belleville, US
★★★★★ 5
Tennis balls
Color: Squeaky-Multi Colors, Size: 2.5"(Medium)-12 Pack
Nice tennis balls, my dog loves them! Great value.
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Reviewed in the United States on May 25, 2026
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Lynn Dion
Chelsea, US
★★★★★ 5
Bright color and tough skin both great
Color: Regular-Orange, Size: 2.5"(Medium)-12 Pack
These tennis-style balls are, as promised, much tougher and thicker-skinned than an ordinary tennis ball, being made as a fetching ball for dogs. I bought them as foot covers for the legs of walkers used by the elderly, a very popular use. They work extremely well to protect rugs and flooring, and to make a quiet gliding cover, easier for seniors to move smoothly without snags. The usual tennis balls used for this purpose wear out pretty quickly, but this ball was made to be repeatedly fetched and gnawed on by your Rottweiler, so it's a big improvement. You will need a good cutting tool to score in the crosswise slits where you insert the walker leg; it's too tough for your household scissors, but that's just the point, right? It's tough. Very much recommended!
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Reviewed in the United States on March 8, 2024

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