Meross MS400 Smart Leak Sensor Review

Meross MS400 Leak sensor in pinterest pin

Do you worry about flooding in your house? Would you like to be notified when a leak or flood occurs? I recently set up and tested the Meross MS400 smart leak sensor. Is this leak sensor any good? How hard is it to set up? Read this quick review to find the answers to these questions.

Editor’s note: I received the Meross MS400 leak sensor free of charge in exchange for a review. This in no way affects my review. My opinion is always an honest one.

This page contains affiliate links. If you purchase an item using an affiliate link I will receive a small commission at no cost to you. Affiliates do not influence my recommendations. Read my disclosures for more information.

Meross MS400 Specs

You can get the sensor by itself (MS400) or the MS400HHK kit, which includes the Meross Wi-Fi hub (the MSH300HK). You need to have this Wi-Fi hub to use this sensor and some other devices. The hub makes these devices available via the cloud and adds integration with other ecosystems like Alexa, Google Assistant, and HomeKit. If you already have one of those, you don’t need the kit, just the sensor.

I already have the Meross MS100FHHK kit (temperature and humidity kit) which includes the Wi-Fi hub, so I don’t need the Wi-Fi hub that came with this kit. If you want to learn more about the hub, be sure to read that review article.

Editor’s Note: You can buy the MS400HHK and other Meross devices directly from Meross. Use the code HTH15 for 15% off.

See also  Wiring the Shelly Plus 1 Relay

Below are the specs for the MS400:

Dimensions2.3 × 1.6 × 0.8 inches
BatteryCR123A Battery, replaceable
Alarm volumeAbout 60 dB (A) at 1m (3ft)
Wireless standards433MHz (between smart hub and sensor), 802.11 b/g/n, 2.4GHz (smart hub)
System requirementsiOS 13 or later, Android 6.0 or later
Operating temperature0°C~40°C (32°F~104°F)
Smart home compatibilityGoogle Assistant, Amazon Alexa, Apple HomeKit, Home Assistant

What’s in the box?

MS400 package contents
  • MS400 Smart Water Leak Sensor
  • MSH300HK Smart Wi-Fi Hub
  • USB-A to micro USB cable
  • Power brick
  • Conductive fabric

Meross MS400 setup

Setting up the device is straightforward. You first must download the app and create an account if you haven’t already. You’ll also need to provision the Wi-Fi hub. Again, how to do this is detailed in my previous Meross device review.

  1. Click the + button at the top of the app to add the MS400 sensor. You’ll have a list of device categories to choose from and you’ll want to choose from the sensors, and then select the MS400.
  2. Then you just follow the steps in the app. You’ll need the provided conductive fabric to put the MS400 into pairing mode. The sensor has three conductive sensors on the bottom. You need to touch the conductive fabric to the sensor on the bottom and one of the other two sensors (circled below) three times within 5 seconds to enter pairing mode.

When it is done pairing, you’ll see the device available in the Meross app.

Adding the leak sensor to Home Assistant

As regular readers know, I am a big Home Assistant fan. It is the perfect smart home hub for me. My smart home devices need to be able to integrate with Home Assistant so I can maximize the “smarts” in my smart home.

See also  Dusun Home Assistant IoT Gateway Review

Integrating any device connected to the Meross Wi-Fi hub is straightforward. You can use Home Assistant’s HomeKit Controller integration. Chances are, the Meross hub was already detected by Home Assistant and is waiting to be set up. If it hasn’t you can simply add the integration.

Either way, you’ll be asked for a pairing code. This can be found on the side of the Meross Wi-Fi hub. After entering it, Home Assistant will automatically create a binary sensor for the MS400 leak detector. That’s all it takes.

Using the Meross Water Leak sensor

There is not much to “use” with a water leak sensor. I put it in a little bit of water and immediately got a sound warning and an alert in my app (and in Home Assistant). That’s what you want from a leak detector!

That said, you can configure a few settings via the app:

  • You can set it to alert when a water leak is detected, no longer detected, or when the battery is low (Alert). You can also decide whether you want an audible alarm or not (Sound alarm)
  • You can have this device trigger an action by another Meross device (Automation)
Meross MS400 App settings
Meross MS400 Device Settings in App

The only thing I have to decide is whether to put this in my laundry room or replace one of my basement leak sensors, which leads me to…

MS400 alternatives

There are lots of leak sensors out there on the market. I have two others:

What sets the Meross leak sensor apart from these sensors is integration with the Meross ecosystem and compatibility with HomeKit. Plus, it just seems more solidly built and constructed.

My FortrezZ is long in the tooth and keeps reporting 0% battery, so I think I’ll replace that sensor with this one.

See also  Matter: The Future of the Smart Home?

Also, here are some alternative popular leak sensors on Amazon:

Final thoughts

The Meross MS400 smart leak sensor is another solid Meross product. I’ve reviewed a few Meross products over the last few months:

And all have been solid and reliable.

A reader sent me a comment noting that Meross support is non-existent. I haven’t had any problems with Meross support, personally. I have only used them to get information about a product. I reached out to Meross directly and here was their response:

If you are looking for a leak sensor, I recommend this one.

Share this:

2 thoughts on “Meross MS400 Smart Leak Sensor Review”

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Meross MS400 Smart Leak Sensor Review

by HomeTechHacker time to read: 4 min