I recently got a few smart home sensors from Meross, and I thought it would be fun to test them out. They sent me a presence sensor, a water leak sensor, and a smart sprinkler timer, and I wanted to see how they would work in my own setup. Since I already use Home Assistant, I was curious to find out how smoothly these devices would connect and what kind of data they would give me.
In a previous video, I showed how the presence sensor worked with Matter inside Home Assistant, but this time I wanted to take a closer look. I also wanted to see what extra options I could unlock by using the Meross app alongside Home Assistant. My goal was to understand how each of these sensors behaves in a real home and whether they could be useful for everyday automation.
So in this article, I’ll share my experience setting up all three devices, testing their features, and checking how well they fit into my smart home system.
Devices under test
Meross Presence Sensor (MS600)
I started with the Meross presence sensor, the MS600, since I already had it connected to into Home Assistant. The sensor provides two main pieces of data: the current light level in the room, called illuminance, and whether the sensor detected someone present or not. Watching it over a few days, I could see periods when it registered movement and periods when the room was clear. It seemed to respond accurately to actual presence in the room. The sensor has both a PIR sensor and a mmWave sensor so it can use the PIR for the initial movement and it then activates the mmWave sensor to continually monitor if there is a person stationary in the room.
Next, I tried covering the sensor to see how the illuminance readings would change. The sensor can trigger automations based on changes in light, so dimming the room or letting sunlight in would affect its output. This is useful if you want lights to turn on automatically when a room gets dark, or just to track who is in a space at certain times.
After testing it in Home Assistant, I set it up in the Meross app to see what extra options were available. Here, I could adjust things like the detection range, sensitivity, and absence confirmation time. There’s also a feature called space learning that helps the sensor adapt to the room layout. The annoying part with the app was that I had to go through the entire setup wizard, including the space learning option even thou I did not had the sensor mounted in its permanent location. In any case, using the app opened up more ways to automate and fine-tune the sensor, giving me a lot more control over how it works in my home.
Meross Smart Water Leak Sensor (MS405 with MSH400 Hub)
The next device I tried was the Meross water leak sensor, model MS405. This one comes in two parts: a small hub that stays plugged in and a battery-powered probe that you place where leaks might happen. Inside the box were the hub, the probe, and a power adapter. The probe already had AA batteries installed, so I was able to press the button and hear a loud beep right away, which showed it was active.
I set up the hub using the Meross app, and once it was connected to Wi-Fi, I paired it with the probe by double-pressing the buttons on the two devices. When I dripped some water onto the sensor, both the probe and the hub started beeping loudly. At first, I didn’t get a notification on my phone, but after enabling notifications in the app, it worked as expected. Now, whenever water touched the contacts, I got a clear alert on my phone in addition to the audible alarm.
Even though this sensor doesn’t advertise Home Assistant support, I was able to link the hub into Home Assistant by adding it as a HomeKit device. Once it showed up there, I could see the leak status change from dry to wet instantly during my tests. That means I could use it in automations, like shutting off a water valve or sending an alert if a leak happens in the basement.
Meross Smart Sprinkler Timer (MST100)
The last device I tested was the Meross smart sprinkler timer, the MST100. Right away, I noticed the build felt sturdy, with brass fittings for the water inlet and outlet. It runs on four AA batteries, and the manual makes it clear to use standard alkaline ones instead of rechargeable, since the lower voltage (1.2V) of rechargeable batteries can cause problems. After adding the batteries and sealing the cover with its rubber gasket, the device powered on and was ready to pair.
In the Meross app, I was able to connect it through the same hub I used for the leak sensor. From there, I could set watering schedules, adjust how long each session runs, and even add a weather skip feature so it doesn’t water when rain is expected. Another nice touch was the water usage table, which keeps track of how much water flows through the device. There’s also an option to set up multiple plans, so I made one for early morning watering and another at night when water pressure is higher.
Once paired, the sprinkler timer also showed up in Home Assistant without me doing anything extra. I could turn it on or off directly from there, and it synced quickly with the app. When I tested it without hooking it to a tap, it even gave me a warning about abnormal water flow, which could be useful if there’s ever a problem in the system. Between the scheduling, usage tracking, and alerts, this felt like a very practical addition to my setup.
Final Thoughts
After spending some time with these three Meross devices, I was impressed by how smoothly they worked, both with the Meross app and with Home Assistant. The presence sensor gave reliable detection and handy light readings, the water leak sensor was loud and clear when triggered, and the sprinkler timer had more features than I expected, especially with scheduling and water usage tracking.
What stood out the most was how easy it was to get each device running. Even when I had small hiccups, like notifications not showing at first, the fixes were simple. Once connected, the sensors stayed stable and gave me data I could actually use for automations. Being able to link them into Home Assistant made them even more flexible, since I could combine them with other devices I already have.
Overall, I think these sensors are solid options if you’re looking to expand your smart home without making things complicated. I’ll be installing them properly around my home and using them day to day, and I’m curious to see how they hold up over time.
Other smart devices from Meross
- Power Strip
- Underfloor Heating Termostat
- Smoke Alarm
- Temperature and Humidity Sensor
- Garage Door Opener
- Smart Plug
- Smart Table Lamp
- and more...
