The Best Water & Temperature Sensors 2026

1. Emerson - Sensi Smart Temperature and Humidity Sensor - White

Emerson Sensi Room Sensor for Sensi Touch 2 - White (RS01-SG) (Refurbished) Emerson Sensi Room Sensor for Sensi Touch 2, White version. Model: (RS01-SG). Features: Sensi room sensors are designed to remotely monitor and control temperatures in different rooms of your home. When paired with the Sensi Touch 2 smart thermostat, room sensors can help reduce hot and cold spots by prioritizing or balancing temperatures where you need it most. (Refurbished)

Upgrade your comfort with the Sensi Room Sensor, made exclusively for the Sensi Touch 2 Smart Thermostat (not included). With a slim design, easy connection, and no wires, you’ll have the flexibility to place your Sensi Room Sensor where you need it, using the stand (included) or on the wall. With a range of 100 feet, you can connect to 15 Sensi Room Sensors to your Sensi Touch 2 Smart Thermostat throughout your home, helping to reduce hot and cold spots by prioritizing and balancing temperatures. 2 AAA batteries required per sensor.

2. SimpliSafe - Water Sensor - White

Connects to compatible devices via 3G, 4G, 4G LTE or Bluetooth; Split-Spectrum, ionization and photoelectric sensors; Nest app (download required); mounting hardware included

Be notified of possible home flooding with this SimpliSafe water sensor. It emits an audible alert when it touches water to provide an immediate warning, and it works with SimpliSafe alarm monitoring plans to deliver email alerts when you're away. This SimpliSafe water sensor has double-sided tape to hold it securely in areas where water damage is possible.

3. Google Temp Sensor (1pk) 2nd Gen

The Nest Temperature Sensor (2nd gen) makes it easy to manage hot and cold spots throughout your home. Just put it in a preferred room and get the right temp right where you want it. It’s battery powered**, so you can set it, then forget it’s even there.*** Nest thermostat sold separately. **Approximate battery life based on testing conducted in Taiwan in 2024 on pre-production hardware and software. Actual battery life may vary. ***Google Home app required. See here for details (g.co/nest/tempsensorapp). Some features are limited to the Google Home app. Remote control requires working internet and Wi-Fi.

It’s simple to set up and control in the Google Home app*; just use the app to set the temperature a room should reach at a certain time of day. Easily to manage hot and cold spots throughout your home*; put it in any room to get the right temperature, right where you want it The battery lasts up to 3 years, so you can put it on a wall, shelf, or wherever you want.** Sleek and simple, the Nest Temperature Sensor fits right in wherever you place it.*** *Google Home app required. See here for details (g.co/nest/tempsensorapp). Some features are limited to the Google Home app. Remote control requires working internet and Wi-Fi. **Approximate battery life based on testing conducted in Taiwan in 2024 on pre-production hardware and software. Actual battery life may vary. ***Nest thermostat sold separately.

4. Google - Nest Temperature Sensor (2nd gen) 3-pack - Porcelain

The Nest Temperature Sensor (2nd gen) makes it easy to manage hot and cold spots throughout your home. Just put it in a preferred room and get the right temp right where you want it. It’s battery powered**, so you can set it, then forget it’s even there.*** Nest thermostat sold separately. **Approximate battery life based on testing conducted in Taiwan in 2024 on pre-production hardware and software. Actual battery life may vary. ***Google Home app required. See here for details (g.co/nest/tempsensorapp). Some features are limited to the Google Home app. Remote control requires working internet and Wi-Fi.

The right temp in just the right spot - Meet the Nest Temperature Sensor (2nd gen). Now it’s easy to manage hot and cold spots throughout your home. Just put it in your preferred room and get the right temp, right where you want it. It’s battery powered, so you can set it, then forget it’s even there.¹

5. SimpliSafe - Temperature Sensor - White

Freeze alarm of 41° F; upper temperature limit; battery pre-installed; simple installation

Protect your home from burst pipes with this SimpliSafe Temperature Sensor. It sounds an alarm if the temperature drops below 41 degrees F, and with a monitoring plan, you can receive a phone call, text or email notification of a potential freeze. Place this SimpliSafe Temperature sensor in any climate-controlled room to protect fine art and other temperature-sensitive items.

6. Honeywell Home - Smart Room Sensor - White

Connects to compatible devices via 3G, 4G, 4G LTE or Bluetooth; Split-Spectrum, ionization and photoelectric sensors; Nest app (download required); mounting hardware included

Optimize overall comfort in any room with this Honeywell Home smart room sensor. User-friendly controls let you define ideal comfort settings depending on time and weather conditions, while the 200-foot sensor range ensures effective monitoring of almost every part of the room. This Honeywell Home smart room sensor features a simple design for quick installation.

7. Ecobee EB-RSHM2PK-01 Decibel Rating 1 Maximum Range 1 Range White Household Sensors and Alarms Smart Sensor 2 Pieces 2 Pack

The ecobee room sensors are a great way to expand on your Ecobee system and get the most out of its capabilities. The all-new SmartSensor catches eyes and detects both temperature and occupancy—faster and from further away. Bring your home to life SmartSensor unlocks the full power of your ecobee thermostat for enhanced comfort when you’re home and savings when you’re away. Works with SmartThermostat with voice control, ecobee4, ecobee3 lite, and ecobee3. Cat: ECBEBRSHM2PK01 Item: 1445696 Cat: EB-RSHM2PK-01 Mfr: Ecobee UPC: 627988021119 Type: Sensor, Smart

Ecobee EB-RSHM2PK-01 Decibel Rating 1 Maximum Range 1 Range White Household Sensors and Alarms Smart Sensor 2 Pieces 2 Pack Knows when a room is occupied and communicates the temperature to your ecobee smart thermostat from up to a range of 60 ft, through walls and floors This prompts your thermostat to make temperature adjustments ensuring comfort Understands your household comings and goings, saving energy and money by not heating or cooling an empty home Enables you to see the temperature difference and occupancy in particular parts of your home and adjust right from the ecobee app for maximum comfort Quick and easy installation Place your SmartSensor magnetically and wirelessly at least 5 ft above the floor on its satin-steel stand or on any wall using the self-adhesive wall mounting brackets Detects unexpected motion (ecobee Smart Security subscription required) When Smart Security is armed, you receive real-time alerts on the ecobee app, so you know what’s happening at home when you’re not there

8. Arlo - All-in-One Sensor with 8 sensing functions for Home Security System, 1 Pack - White

Expand your security system protection with the advanced Arlo All-in-One Sensor. With eight sensing functions in one compact, go-anywhere design, just place the All-in-One Sensor anywhere you need coverage and easily pick one or more detection functions you want through the Arlo Secure App. Add-on sensor only, requires Arlo Home Security System SS1201, SS1501, or SS1502 (sold separately).

9. Aqara - FP2 Presence Sensor- mmWave Radar Sensor, Zone Positioning, Multi-Person and Fall Detection, Sleep Monitoring - White

The Aqara® Presence Sensor FP2 uses cutting-edge millimeter-wave radar technology, which can accurately detect the presence of people even with slight movements. This technology ensures continuity and stability of the smart device. Each sensor also has the function of zone positioning, which allows for the automation of different conditions in different zones, such as beds and tables. 1 sensor in 1 space can now be divided into up to 30 small zones and recognize up to 5 targets for multi-person detection. It can also control other smart home devices through ecosystems such as Apple® Home to achieve wider applications. It features functions such as human fall recognition, sleep monitoring, and a built-in light sensor. Likewise, it is a great helper that can truly combine the diversity of your home life and realize the automation of different personalities.

Aqara Presence Sensor FP2 uses cutting-edge millimeter-wave radar technology, which can accurately detect the presence of people even with slight movements. This technology ensures continuity and stability of the smart device. It also has the function of zone positioning, which allows for the automation of different conditions in different zones, such as beds and tables. One space can now be divided into up to 30 small zones and recognize up to five targets (Multi-person Detection). It can also control other smart home devices through ecosystems such as Apple Home to achieve wider applications. It features functions such as human fall recognition, sleep monitoring and a built-in light sensor. Likewise, it is a great helper that can truly combine the diversity of the user's home life and realize the automation of different personalities.

10. Arlo - Home Security System Bundle - White

Customize your security and make protecting your home even easier. Get greater protection from All-in-One Sensors integrated with 8 sensing functions, giving you flexibility to place them anywhere inside your home. Receive alerts when motion, open/close, leak, freeze, tilt, ambient lighting, or smoke and CO alarms are detected. Rapidly send fire, police, or medical responders to your home with One Tap Emergency Response from the Hub or Arlo Secure App. Opt in for 24/7 protection from Live Security Experts that monitor your home, so you don’t have to. Experience better whole home protection with SecureLink’s extended range and secure connection.