Thirsty Light Bumble Bee

Thirsty Light Bumble Bee

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Item Details

The Thirsty Light is an intuitive 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 continuosly monitors conditions, testing the moisture level once per second.

The circuit that drives the device, called Drypoint, 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, until it reaches the fifth level, "completely dry", which puts the device in 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, and is backed by a 30 day manufacturer's warranty.


  • Drypoint Digital Circuit
  • Long-lasting LED
  • Corrosion resistant Brass Probe
  • 2 replaceable 1.5V batteries
  • ABS plastic casing
  • On/Off switch
Patent pending
Designed in USA
Made in China

Drypoint Circuit:
Frequency of testing: once per second.
Moisture levels: 5

Blinking Patterns:
  • No blink: Moisture detected
  • Slow blink: Starting to get dry.
  • Medium blink: Dry
  • Fast Blink: Very dry
  • Double blink w/ pause: Completely dry/Standby
Low battery voltage mode: Slow triple blink
Battery life: Depends on how much the light is allowed to blink. Optimal battery life is 12 months.

Perfect For:
  • Forgetful plant waterers
  • Chronic over-waterers
  • Vacation watering helpers
  • Plantcare services
  • Indoor gardeners
  • Botanical gardens
  • Nurseries
  • Offices
  • Homes
  • College students
  • Brown thumbs
  • Green thumbs
  • Avid gardeners
  • New plant owners

Item Specifications
Item Number: 138501
Universal Product Code: 638104004190
Manufacturer: Hydrofarm
Manufacturer's Part Number: HGTLBB
Brand: Thirsty Light

Additional Documents
pdf file Instructions
pdf file Information Sheet

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How It Works

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