Thirsty Light


Thirsty Light – digital plant moisture sensor for potted plants, garden and lawn

The thirsty light warns you when to water your houseplant by a flashing light when your plant is thirsty. Taking care of your plant has never been so easy!

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SKU: PCT060 Category:

The Thirsty Light monitors the moisture level of potted plants

This digital moisture sensor is mostly used for house plants indoors

The Thirsty Light is a digital plant moisture sensor that blinks an LED to alert the user when it’s time to water a potted plant, house plant or container plant. It is designed to be unobtrusive when left in the soil of a plant, where it continuously monitors conditions, testing the moisture level once per second.

Know when to water your plants with the Thirsty Light and forget any guesswork

Improper watering kills or injures houseplants more than any other cause. Overwatering is just as harmful to your plants as under-watering. The Thirsty Light has been created so you’ll always know when your plants’ water supply is just right. It blinks a LED light to alert the user when it’s time to water. This moisture meter has 5 levels of sensitivity and makes the LED blink faster as the soil gets drier. With this tester, you’ll never have to guess when your plants need watering and you won’t forget to water your plants because the blinking light will remind you.

The Thirsty Light warns you with a blinking light when water is needed

The Thirsty Light uses the process of electrolysis and is also referred to as an EC-meter (Electrical Conductivity) in technical terms. It works on the same principles as a plant. Like the roots of a plant, it “absorbs” water from the soil. By measuring the moisture level in the soil, it can be determined whether there is sufficient water left. The blinking of the light will show you directly the condition of the soil and will enable you to act directly if necessary.

How to use the Thirsty Light, a warning digital plant moisture sensor

The Thirsty Light blinks when your plant needs watering

Turn the power switch to the “ON” position. The Thirsty Light’s LED alert light will emit a single long blink.

  1. Insert the Thirsty Light into the soil so the pod and approximately 2,5 cm of the probe is above the soil line. Choose a location between the edge of the pot and the plant stem with good visibility of the LED Alert.
  2. No blinking tells you the soil is moist, no need to water. The LED alert blinks to tell you when the soil is dry. Regular blinking means that the soil is dry and needs water. A double blink with a long pause means that the soil is completely dry, so you need to water thoroughly.
  3. If you follow the leave-in method, use one Thirsty Light for each plant, leaving it in the pot. This is the most convenient way to use it because the plant’s soil moisture level is constantly monitored. Leave the misture meter in the soil with the power switch in the “ON” position. The LED Alert will notify you when it’s time to water again. Pay attention, you may need to adjust the probe. It is easy to fine-tune the function of the meter to match a specific plant’s moisture needs. Soil dries from the top down, so the depth of the sensor affects the timing alerts. If the plant is wilting from lack of moisture between watering, choose a new location and insert the probe only 5-7,5 cm deep in the soil. If the Thirsty Light is alerting too soon, push the probe deeper into the soil. Do not allow the pod to come in contact with the soil.
  4. If you use the Quick Check Method, you share one Thirsty Light among several plants, moving the probe from one plant to the next. The digital sensor tests conditions once every second, so each pot’s soil moisture can be assessed quickly and accurately. When you are finished checking the soil and watering, turn the power switch clockwise to the “OFF” position.

Click here to download the english productsheet.


FAQ – Wilting plants? The Thirsty Light blinks before the soil dries out!

The Thirsty Light is not inserted into the soil, when I switch it on nothing happens

Change the batteries (2xLR44)

The Thirsty Light shows a triple blink with a pause

Change the batteries (2xLR44)

How do I change the batteries?

Just unscrew the battery cover, and take it off. Remove the old batteries and put 2 new 1.5V AG13 (LR44) batteries in place. Install the batteries with the polarities oriented as shown (marked in the pod). Put the battery cover in place and verify the batteries are properly installed by turning the power switch to “ON”. The LED alert signal should emit a long blink.
Thirsty Light : position of the batteries

How long do the batteries last?

Under normal circumstances the batteries will last about 1 year.

My plant is wilting, but the Thirsty Light doesn’t blink

For this particular plant the probe of the Thirsty Light has been inserted too deep. Choose a new location and insert the probe only 5-7,5 cm deep in the soil.

The soil is still moist and the Thirsty Light starts already to blink

Push the probe deeper into the soil. Do not allow the pod to come in contact with the soil.

You wil find more information for the Thirsty-Light here.

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