Here are a few water leak detection devices for sale, used:

  • Flume 2 Smart Home Water Monitor & Water Leak Detector

This smart water leak detector can be placed anywhere in your home to monitor for leaks and send alerts to your smartphone. It also tracks your water usage and can help you identify areas where you can save water.

  • Guardian GLD1 Waterproof Elexa Leak Detector Prevention System

This water leak detector is waterproof and can be used indoors or outdoors. It can also be connected to Alexa for voice control.

  • Elitech WJL-6000 AC Air Conditioner Freon Refrigerant Halogen Leak Detector

This water leak detector is specifically designed for detecting refrigerant leaks in air conditioners. It is also sensitive to other types of gases, such as butane and propane.

  • Underground Water Pipe Leakage Monitor Kit V3W0

This water leak detector is designed to detect leaks in underground water pipes. It uses a sensor that is placed in the ground and will sound an alarm if it detects water.

  • Water Pipe Leak Detector Sensor

This water leak detector sensor is small and lightweight and can be attached to any pipe. It will sound an alarm if it detects water.

When purchasing a used water leak detection device, it is important to inspect it carefully for any damage. You should also make sure that the device is still under warranty.

You can find used water leak detection devices for sale on websites like eBay, Craigslist, and Facebook Marketplace. You can also check with local plumbing supply stores or hardware stores.