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Thirsty Light Original Digital Indoor Plant Moisture Sensor

2.7 out of 5 stars 97 customer reviews

Price: $8.32 & FREE Shipping on orders over $49. Details
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  • LED light alerts user when plant needs water
  • Corrosion resistant brass probe
  • 2 Replaceable 1/5v batteries
  • ABS plastic casing
  • Perfect for forgetful plant waterers
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$8.32 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Thirsty Light Original Digital Indoor Plant Moisture Sensor
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Total price: $16.31
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Technical Details


Product Description

Product Description

The Thirsty Light is a digital plant moisture sensor that blinks an LED to alert the user when it is time to water a potted 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. Thirsty Light can sense 5 different levels of dryness, causing the light to blink faster as the soil gets dryer, increasing the urgency of its call to action. When it reaches the fifth level, "completely dry", the device goes into standby mode to conserve electricity, emitting a double blink every 3 seconds. There is a low-battery mode as well: a slow triple blink. The Thirsty Light comes with a comprehensive and informative user and watering guide.

Amazon.com

Take the guesswork out of watering your potted plants with the Hydrofarm Thirsty Light Original Digital Indoor Plant Moisture Sensor. When a plant's soil becomes dry, the LED on the Thirsty Light blinks to let you know. The sensor head measures just over 2-inches long, so you won't even know it's there until it starts blinking. You can leave the resilient sensor in one pot, or use it to periodically check moisture levels in all your indoor pots--it tests conditions in one second, providing fast, accurate reads.

At a Glance
Hydrofarm Thirsty Light Original Digital Indoor Plant Moisture Sensor
At a Glance:
  • LED light blinks when soil becomes dry

  • Sensor detects five different levels of dryness

  • Unobtrusive design blends in until light starts blinking

  • Durable brass probe resists corrosion

  • 30-day limited warranty
At a Glance
Hydrofarm Thirsty Light Original Digital Indoor Plant Moisture Sensor
Take the guesswork out of watering
your potted plants. View larger.
Hydrofarm Thirsty Light Original Digital Indoor Plant Moisture Sensor
Blinking LED light lets you know when soil is dry. View larger.
LED Alert Tells You When to Water Plants
Thirsty Light continuously monitors the condition of the soil in your potted plants, testing the moisture level once every second. The senor top features a small LED light that flashes once it's time to water your plant. While the sensor measures a total 6.5 inches, the green top is a mere 2-inches long, so you won't notice it until the soil becomes dry.

By letting you know when your potted plants need water, Thirsty Light eliminates the temptation to overwater plants. A comprehensive user and watering guide is included.

Light Blinks Faster as Soil Becomes Dryer
This sensor uses Drypoint technology, which can sense five different levels of dryness. As the soil gets dryer, the light blinks faster, letting you know how urgent the need for water is becoming. The included moisture signal chart explains each blinking pattern, as well as where to properly insert the sensor's probe.

The sensor also has a unique blinking pattern to indicate when the batteries are low.

Resilient and Long-Lasting Probe
Thirsty Light features an ABS plastic casing and a durable brass probe. With constant use, the probe will change color and develop a patina, which simply helps protect it from corrosion. If left in soil for long periods of time, simply wipe the probe with a damp cloth to remove mineral deposits.

Product and Warranty Information
The Thirsty Light is backed by a manufacturer's 30-day limited warranty against defects in materials and workmanship. It's powered by two included 1.5-volt lithium batteries that can be replaced when necessary.

What's in the Box
Moisture sensor, two batteries, and user guide.



Product Information

Product Dimensions 9.5 x 3.2 x 0.2 inches
Item Weight 3.2 ounces
Shipping Weight 0.8 ounces (View shipping rates and policies)
Department Teak
Manufacturer Hydrofarm
ASIN B0017RXJUS
Item model number HGTL
Batteries 2 CR2 batteries required. (included)
Customer Reviews
2.7 out of 5 stars 97 customer reviews

2.7 out of 5 stars
Best Sellers Rank #57,144 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
#86 in Patio, Lawn & Garden > Gardening > Gardening Tools > Soil Test Kits

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By James on January 5, 2013
Verified Purchase
If I watered my plants according to this gizmo, they'd better be able to morph into kelp because they would be living underwater! I tried it on 4 different plants, and after thoroughly watering the plant, the blinking light still indicated that the plants needed watering. It worked for a brief spell with one of the plants and the blinking stopped for a few hours, but then started blinking again -- this thing will have all my plants overwatered and very unhappy, if they survived at all! It's just a blinking light and pretty much nothing else---it costs $8 and isn't worth the time and effort to return it, but hopefully, anyone reading this won't make the mistake that I did and buy one of these useless things!
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I ordered three of these. I turned the first one to the on position expecting a click or something and I ended up twisting too hard i guess. The little knobs on the on switch broke under limited twisting pressure. I was much more careful with the other two, but it would have sucked if I only got one. When you go to turn it on, make sure to gently rotate to the on button and do not twist too much. This is only the first day, but the other two seem to be working as advertised. When I stuck one in a plant, it started blinking immediately, then subsided when water was applied. The second one was put into a plant that did not need water.

On a side note, the water sensor is only two pieces of metal separated by plastic. I bet one could easily make one of these things with just an LED and a battery. Just a thought.
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I'm terrible with houseplants. I received one of these as a gift, and for two years it's been keeping my plant alive - never even had to change the battery. I'm looking to buy a second one.
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I bought 12 of these things. Within a week I had to replace all the batteries! About $6..00 for 3 batteries. Then in 2 weeks the batteries went dead again. I replaced 2 of them and within week they stopped working. The idea is really great but the product just isn't what it could/should be. Stay away from these things!
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Verified Purchase
I bought two of these novel gadgets.
The concept, product appearance and packaging are all excellent. Unfortunately they don't work. As an initial test I thought it would be useful to compare the accuracy of the two sensors by placing them next to each other in the same pot. Hopefully, they would each begin to flash within 24 hours of each other when a dry soil condition was detected. I waited a few days, and then a few more. Finally I pulled them both out of the soil and found that the metal tips (anodes) on each one were corroded and the batteries in each was fully discharged (dead). A week earlier the metal tips had a brushed satin luster - similar to other moisture sensors I have used.

After jut six days in the soil they both became so pitted and corroded that neither steel wool nor sandpaper would restore them to their original appearance and functionality. Even with fresh batteries these pitted anodes prevented the sensors from functioning. Looking closely at my other moisture sensors they all seemed to have either stainless or nickel-plated anodes, and after years of use they still perform as new.
As I said, nice idea but ...an absolute waste of money.
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Verified Purchase
I have had this thing in my houseplants for about a month now. I don't really know if it works or not. I got curious and thought it was dead at one point, so I took it out of the container. I ordered three and one didn't work. The refund was hassle free, but I think I need a digital one with some actual moisture content readout so I can verify it is doing something.
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Verified Purchase
I have a small tree in my apartment that I had a habit of over-watering. I stuck this in the pot and now I know not to water unless the light is flashing. My plant is no longer water logged and seems much happier. The Thirsty light would also work well for people who tend to underwater and need a reminder.

Note: You can leave it in like I do, or save battery and just check the soil periodically.
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Verified Purchase
I have had five of these in my plants for several years and love them. I have had no problems with over or under watering plants and know it has kept my plants alive and well despite my black thumb. I just recently replaced the batteries in one of the lights. I had to order the batteries from Amazon and the tiny screw in the light was a challenge but, mission accomplished, and the light is back in working order.
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