SCS Direct’s Leak Bug 3-Pack is a simple, no-fuss solution for a problem most homeowners ignore until it’s too late. These sensors detect water as shallow as 1/32 of an inch—that’s barely a film on the floor. Place them near a water heater, under a kitchen sink, or by a basement window, and they’ll catch a slow drip before it turns into a soaked carpet or warped baseboard. No app, no Wi-Fi, no monthly subscription. Just a loud 90-decibel alarm that you can hear from two rooms away.

The sensors run on included batteries, so they work even during a power outage. That matters when a pipe bursts at 2 AM. The contact sensor technology is straightforward: water bridges the contacts, the alarm sounds. It’s not smart home compatible in the traditional sense—there’s no voice control or phone notification. You get a physical alert, and that’s it. For a $20 three-pack, that trade-off makes sense. You can mount them on a wall or set them on the floor, though the wall mount option is limited since the sensor needs to touch water to trigger.

One honest limitation: the alarm is loud but not adjustable. If you have hearing issues or sleep deeply, you might miss it. And because there’s no remote alert, this setup works best if you’re home regularly. For a vacation house or a basement you rarely visit, you’d want a connected sensor. But for everyday leak detection in high-risk spots, the Leak Bug does exactly what it promises—no fuss, no frills, just a loud warning when water shows up.