Meross Smart Temperature and Humidity Sensor Review – MS100FHHK

Following on from my reviews of the superb Meross MSP843P Smart Fast Charging Power Strip and the good, albeit with a flawed design Meross Outdoor Smart Plug, I have also been checking out the MS100FHHK Smart Temperature and Humidity Sensor.

This is an innovative addition to the world of smart home devices. With its unique solar-powered design, this sensor offers an extended battery life and eliminates the need for battery replacements.

Specification

Let’s begin our review by looking at the specifications of the Meross Smart Temperature and Humidity Sensor MS100FHHK.

The Meross MS100FHHK sensor offers several key features that make it a valuable addition to any smart home setup.

Battery Replacement-Free for Life

One of the standout features of the Meross MS100FHHK sensor is its ability to self-charge its battery using ambient light. The built-in solar panel collects energy from the surrounding environment, ensuring that the sensor remains powered without the need for battery replacements or manual charging. This feature provides a hassle-free experience and eliminates the worry of battery life.

Remote Monitoring

With the Meross MS100FHHK sensor, you can monitor the temperature and humidity levels in your home from anywhere, as long as you have an internet connection. The sensor sends real-time data to the Meross app, allowing you to stay informed about the conditions in your home even when you’re away.

Precision Detection

The Meross MS100FHHK sensor features a built-in 4th generation Swiss-made high-precision sensor. This ensures accurate temperature and humidity readings, providing you with reliable data to monitor and adjust your home’s environment.

Multi-Scenes

The Meross MS100FHHK sensor can be used in various scenarios to monitor temperature and humidity levels. Whether it’s in a baby’s room, a refrigerator, a basement, or any other area of your home, this sensor allows you to keep track of the conditions and make adjustments as needed.

Real-time Alert Notifications

The Meross MS100FHHK sensor allows you to set predefined thresholds for temperature and humidity levels. If these thresholds are surpassed, you will receive instant notifications through the dedicated Meross app. This feature ensures that you stay informed of any significant changes in the environment and can take appropriate action.

Devices Automation

Integrating the Meross MS100FHHK sensor with other Meross devices opens up possibilities for automation. You can set temperature and humidity conditions to trigger actions such as turning on or off plugs, lights, and switches. This automation capability allows you to create a more efficient and comfortable home environment.

2-Year Data Storage & Export

The Meross MS100FHHK sensor stores temperature and humidity data for up to 2 years. This historical data can be accessed through the Meross app, allowing you to track trends and analyse changes over time. You also have the option to export this data for further analysis or record-keeping purposes.

Design & Build

In terms of design, the Meross MS100FHHK sensor features a compact and sleek form factor. It measures 56 × 56 × 18 mm and weighs 40g. The sensor is predominantly white in colour, blending seamlessly into any environment.

The front of the sensor houses a small solar panel, which absorbs ambient light to power the device. It is important to note that the solar panel does not display any content and is not an LCD screen. It simply collects energy to keep the sensor running without consuming battery power.

On the back of the sensor, you’ll find a reset button, which can be accessed using the provided pin tool. This button allows you to initiate a factory reset or put the sensor into pairing mode.

Connectivity

The Meross MS100FHHK sensor requires a central hub. The hub acts as a bridge between the sensor and various smart home platforms, including Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings.

The hub communicates with the sensor using a 433MHz radio link, which provides a reliable and interference-resistant connection. This wireless communication ensures that the sensor can transmit data to the hub without interruption.

It’s worth noting that the Meross MS100FHHK sensor cannot function independently and relies on the hub for connectivity and integration with other devices and platforms. The hub can also support other Meross wireless sensors, enabling you to expand your smart home capabilities with additional sensors if desired.

Set Up & Mobile App

Setting up the Meross MS100FHHK sensor involves a straightforward process that can be easily completed using the Meross app.

To begin, you’ll need to plug in the Meross hub and press the pairing button on the front of the hub twice. This initiates the pairing process. Next, remove the battery tab from the sensor and use the provided pin tool to put the sensor into pairing mode. The hub and sensor will then establish a connection, and you’ll be ready to proceed with the setup.

Once the initial pairing is complete, you’ll need to follow the instructions within the Meross app to connect the hub to your desired smart home platforms. The app provides a user-friendly interface for managing and customising your smart home devices, including the MS100FHHK sensor. It allows you to view real-time data, set thresholds, configure alerts, and access historical data.

The Meross app is available for both Android and iOS devices, ensuring compatibility with a wide range of smartphones and tablets. It provides a seamless and intuitive user experience, making it easy to navigate and configure your smart home devices.

Automation Features

The Meross MS100FHHK sensor offers automation features that allow you to create customised routines and scenarios based on temperature and humidity conditions.

Using the Meross app, you can set specific temperature and humidity thresholds to trigger actions within your smart home ecosystem. For example, you can configure the sensor to turn on a fan when the temperature exceeds a certain level or activate a dehumidifier when the humidity reaches a predefined threshold.

These automation features provide convenience and efficiency, allowing your smart home devices to adapt to changing environmental conditions automatically.

Integration with Third-Party Services

Similar to my other  Meross reviews, the MS100FHHK sensor enjoys compatibility with a wide range of popular smart home platforms, including Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings. This broad compatibility ensures that you can seamlessly integrate the sensor into your existing smart home ecosystem, regardless of your preferred platform.

When integrated with Apple HomeKit, the Meross MS100FHHK sensor can be controlled using Siri voice commands or the Apple Home app. This integration allows you to monitor and adjust temperature and humidity levels alongside other HomeKit-enabled devices in your home.

For users of Amazon Alexa and Google Assistant, the Meross MS100FHHK sensor can be easily linked to these voice assistants. This integration enables you to check temperature and humidity levels using voice commands and create voice-controlled automation routines.

The Meross MS100FHHK sensor also supports integration with SmartThings, allowing you to incorporate it into your SmartThings ecosystem and control it alongside other compatible devices.

Additionally, the Meross app offers integration with IFTTT (If This Then That), a popular automation service. This integration expands the possibilities for creating customised automation routines using the Meross MS100FHHK sensor as a trigger.

Home Assistant & Homey

You then have unofficial support for Home Assistant and Homey.

For Homey, you will need a Homey Pro, as the Mersoss app is a community app.

For Home Assistant, you can either use HomeKit (which I used with the MSS620HK Outdoor Smart Plug) or the Meross LAN app via HACS which is what I have used for both this and the excellent MSP843P Smart Fast Charging Power Strip

Performance

The Meross MS100FHHK sensor delivers reliable and accurate readings, ensuring that you can trust the data it provides.

The built-in 4th generation Swiss-made high-precision sensor guarantees precise temperature and humidity measurements. With a temperature accuracy of ±1°C within the range of 0-40°C and ±2°C outside that range, you can rely on the sensor’s readings for accurate monitoring.

The Meross MS100FHHK sensor transmits temperature and humidity data to the hub every 10 minutes, ensuring that you receive up-to-date information about your home environment. This frequent data transmission enables you to monitor changes in temperature and humidity levels in near real-time.

The sensor’s alert notification feature provides an additional layer of convenience and peace of mind. By setting predefined thresholds for temperature and humidity, you will receive instant notifications through the Meross app if these thresholds are exceeded. This ensures that you stay informed of any significant changes in your home environment that may require your attention.

In terms of responsiveness, the Meross MS100FHHK sensor performs admirably, with minimal delay in triggering automation actions based on temperature and humidity thresholds. This responsiveness allows for a seamless and efficient smart home experience.

Battery Life

The Meross MS100FHHK sensor distinguishes itself from other smart sensors with its solar-powered design. The integrated solar panel collects ambient light to power the sensor, significantly extending its battery life. With sufficient ambient light, the sensor can operate without consuming any battery power, providing a truly battery replacement-free experience.

The solar panel activates when the ambient light intensity reaches approximately 350 Lux and remains stable during operation with a minimum requirement of 150 Lux. This allows the sensor to remain powered even in low-light conditions.

It’s worth noting that the Meross MS100FHHK sensor still has an internal battery to ensure continuous operation during periods of low ambient light. The CR2477 button battery powers the sensor when the solar panel cannot provide sufficient energy. The lifespan of the internal battery will depend on factors such as usage and the availability of ambient light. However, it is expected to last several years before requiring replacement.

This solar-powered design significantly reduces maintenance requirements and provides a more sustainable and eco-friendly solution compared to traditional battery-powered sensors.

My only gripe here is that the app doesn’t appear to show the battery life. I have placed my sensor near my window, so I doubt I will ever have a problem, but it would be reassuring to see what the battery life is. However, it is worth noting that Home Assistant does show the battery life and after almost a month of use, the battery life is still 100%.

Price and Alternative Options

The Meross MS100FHHK sensor is competitively priced at just £32 direct from Meross. It doesn’t currently appear to be available from Amazon.

The sensor by itself appears to be available for US buyers at $29.99.

There are plenty of alternative options out there any many of these are more affordable, but none of them have the solar charging.

The Aqara Temperature and Humidity Sensor is just £20 RRP.

The SwitchBot IP65 Indoor Outdoor Hygrometer Thermometer is a bargain at just £12.

Overall Summary

The Meross MS100FHHK Smart Temperature and Humidity Sensor offers a range of impressive features that enhance the functionality of your smart home. Its solar-powered design ensures an extended battery life, eliminating the need for regular battery replacements. The sensor’s accurate temperature and humidity readings, along with its integration with popular smart home platforms, make it a versatile and reliable addition to any smart home ecosystem.

The Meross app provides a user-friendly interface for managing and customising the sensor, allowing you to set thresholds, configure alerts, access historical data, and create automation routines. The sensor’s compatibility with Apple HomeKit, Home Assistant. Amazon Alexa, Google Assistant, SmartThings, and IFTTT further expands its capabilities and integration options.

With its seamless connectivity, intuitive mobile app, automation features, and long-lasting battery life, the Meross MS100FHHK Smart Temperature and Humidity Sensor offers a comprehensive solution for monitoring and controlling your home’s environment.

James Smythe( Editor-in-chief )

I am James, a UK-based tech enthusiast and the Editor and Owner of Mighty Gadget, which I’ve proudly run since 2007. Passionate about all things technology, my expertise spans from computers and networking to mobile, wearables, and smart home devices.

As a fitness fanatic who loves running and cycling, I also have a keen interest in fitness-related technology, and I take every opportunity to cover this niche on my blog. My diverse interests allow me to bring a unique perspective to tech blogging, merging lifestyle, fitness, and the latest tech trends.

In my academic pursuits, I earned a BSc in Information Systems Design from UCLAN, before advancing my learning with a Master’s Degree in Computing. This advanced study also included Cisco CCNA accreditation, further demonstrating my commitment to understanding and staying ahead of the technology curve.

I’m proud to share that Vuelio has consistently ranked Mighty Gadget as one of the top technology blogs in the UK. With my dedication to technology and drive to share my insights, I aim to continue providing my readers with engaging and informative content.