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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jmb02129
Houston, US
★★★★★ 5
Fantastic Boots!
Size: 8.5, Color: Redwood/Gum 10
Completely satisfied with these boots. True to size, well made, comfortable from the get-go; not break in needed. Waterproof- really. The Red Suede has withstood a nasty winter season & still looks great. Good traction. I like the ankle height which looks good with long, mid length pants & leggings. I love the easy slip on/off aspect..made getting ready for dog walking easy. I 100%recommend!
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Paige
Cuba, US
★★★★★ 5
Definitely worth the price
Size: 6.5, Color: Black/Black
Absolutely love these boots! I originally bought them to wear in NYC in December & they did not disappoint. They were comfortable, cute, durable and worked well in the slush/snow. The traction on the bottom is also nice! They kept me warm with wool socks. I wear them almost daily now. Perfect for everyday. easy to wear with variety of outfits. Good every day shoe.
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Reviewed in the United States on January 3, 2026
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Kimberly
Chelsea, US
★★★★★ 5
Snagged a deal
Size: 7, Color: Redwood/Gum 10
I waited and waited to get these boots! I knew I was chancing it, but they went on sale, and I snagged them! I am a size 7, and they fit nicely with socks. a little loose, barefooted, but what psycho wears boots without socks? They are comfortable and really well-made.
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Reviewed in the United States on April 8, 2026
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ashlynnk
Omaha, US
★★★★★ 4
Cute, comfortable waterproof boots (a little snug to put on)
Size: 7, Color: Velvet Tan/Gum 2
These are really cute Chelsea-style boots and feel very comfortable once they’re on. The waterproof material is great for wet weather and the sole feels sturdy with good traction. They look stylish enough to wear casually but still feel practical for rainy days. The only downside is they can be a little difficult to put on at first because the opening is somewhat snug, but once they’re on they fit well and feel supportive. Overall they’re a great waterproof boot and I’ve enjoyed wearing them.
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Reviewed in the United States on March 17, 2026
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Abby B
Alexandria, US
★★★★★ 5
Surprisingly great for my wide feet and high instep!
Size: 10.5, Color: Velvet Tan/Gum 2
So thrilled I took a chance on these. Finding boots is impossible for me. I have wide feet, a super high instep, a bunion on one foot, and I wear a hard to find size (10.5). I ordered the 10.5 and 11 in these expecting I might need to size up for width (if I could even get them on). It was a struggle getting the 10.5s on the first time, and once I did they were somewhat uncomfortable on the top of my left foot. But I read that they would relax so decided to give it a go because I need waterproof boots for an upcoming trip and the 11s felt too long. After two days of light wear, they are already breaking in and I have no more discomfort. Getting them on is already easier and they are plenty wide enough and very comfortable to walk in. These are true to size. Super happy and worth a day of mild discomfort to break them in!
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Reviewed in the United States on March 7, 2026

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