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  • MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts
  • MarCELL Monitor What MattersMeet MarCELL

MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts

4.5 out of 5 stars (778)

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About this item

  • Best Value – MarCELL Subscription Plans for as low as $8.25/mo, nearly half of what our competitors charge. A MarCELL Subscription Plan is necessary since we operate on cellular networks.
  • Cellular Advantage - MarCELL can be used anywhere there is a Cellular Signal and continues to operate in power outages, unlike Wifi Devices
  • 24/7 Continuous Monitoring - Receive alerts via text, call or email when temperature and humidity levels reach critical levels, or power is lost
  • Real Time Readings - Whenever you check the webpage or app the readings will update (15 minute refresh after first reading)
  • Monitor From Anywhere - Use our intuitive app to view your readings at anytime, from anywhere. Review historic data and get instant updates on current environmental conditions

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Product description

The Original Peace of Mind 3-in-1 Sensor
Made in USA
1000+ 5 Star Ratings

MarCELL has a Sensor for Every Job

3-in-1 Monitor-Verizon

Pet Watch Bundle-Verizon

Home Watch Bundle-Verizon

PRO Sensor-AT&T Network

NIST-Certified Sensor

Customer Reviews
4.5 out of 5 stars 778
5.0 out of 5 stars 2
3.7 out of 5 stars 4
4.4 out of 5 stars 79
5.0 out of 5 stars 1
Price
$119.95 $124.95 $149.95 $199.00 $279.00
Model
Original 3-in-1 Sensor Original+Car Mount & Cable Original+2 Water Drip Senssors Original+Precise Temp Sensor Origial+Nist-Certified Sensor
Recommended for
General Use RVs, Campers, Cars RVs, Campers, Cars Professional Level Remote Temp NIST Temp Tracking & Logging
Temperature Sensor
Humidity Sensor
Power Sensor
sPuck Water Sensor
Vehicle Plug + Mount Bracket
PRO Temp Sensor for Business
NIST Certified Temp Sensor

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MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts


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What's in the box

  • Plug-in Transformer
  • Customer reviews

    4.5 out of 5 stars
    778 global ratings

    Customers say

    Customers find the temperature and humidity monitor easy to set up and use, with accurate readings and notifications that work every 8 hours. The device provides peace of mind, particularly for pets, and saves money on services. Customers appreciate the notifications for power outages and the ability to set temperature alerts in the app.
    AI Generated from the text of customer reviews

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    218 customers mention functionality, 192 positive, 26 negative
    Customers find that the humidity meter works well, with the sensor performing perfectly and providing accurate readings every 8 hours.
    ...But this is a great product that worked perfect during a recent power outage. Great way to inform you of a critical power failure if away from home.Read more
    This works great. Ordered this for our RV as we sometimes leaves our dogs for short periods and always we're worried about the temp....Read more
    ...It’s works well when on the road traveling with our pups and an added bonus when we store our RV at a storage facility which has electric hookups,...Read more
    This product is fantastic. Works as described, the company didn't bill until the start date, their website is easy to use....Read more
    102 customers mention easy to use, 99 positive, 3 negative
    Customers find the humidity meter easy to set up and use.
    ...The MarCELL is easy to use, gives you temperature, humidity and power status several times a day. User app is simple and user-friendly....Read more
    Worked well and was easy to set up. Notified me of a power failure in my RV the first day I used it. My dogs are also grateful!...Read more
    Easy set up and works exactly as advertised. A great product if you leave your home in the great north woods to go someplace warm in the winter.Read more
    ...water puk which will be able to detect water in parts of your home....easy and quick set up and gives me great security knowing I have this kind of...Read more
    64 customers mention temperature monitoring, 51 positive, 13 negative
    Customers appreciate the temperature monitoring capabilities of the device, which can be set in the app and alerts them when it goes out of range.
    ...It's an easy way to monitor the temperature, humidity and power while we're away....Read more
    ...Git gives us peace of mind knowing we can check the temperature and get power outage notifications....Read more
    ...I have two of these units and while the temperature readings are right on, the humidity readings are about 6 percentage points low on both units....Read more
    This device does not provide accurate temperature readings and does not provide live updates....Read more
    61 customers mention peace of mind, 61 positive, 0 negative
    Customers find the humidity meter provides peace of mind, particularly for pets, with some mentioning it saved their pets' lives.
    Great little product. Used for our lake home. East install and peace of mindRead more
    We love love love this. We have it in our RV and it gives us great Peace of Mind knowing that the electricity is on and the temperature is right...Read more
    Gives us peace of mind when we're away from our RV and have to leave the dog in it.Read more
    ...This is a great device that provides great peace of mind!Read more
    54 customers mention accuracy, 44 positive, 10 negative
    Customers find the humidity meter accurate and reliable, with multiple customers noting they receive timely messages about humidity levels. One customer mentions that it records data at each automatic reading and sends updates to their smartphone.
    ...The MarCELL is easy to use, gives you temperature, humidity and power status several times a day. User app is simple and user-friendly....Read more
    ...that the device uses to communicate with the server is both cheap and reliable. If you own a vacation home, you need to buy one of these.Read more
    I have now owned the product for three years. It is accurate and sends the 5G signals on time....Read more
    ...Simple to install and very accurate.Read more
    48 customers mention value for money, 42 positive, 6 negative
    Customers find the humidity meter to be a great investment for its economical price, noting it saves money on services and provides peace of mind.
    ...connection that the device uses to communicate with the server is both cheap and reliable. If you own a vacation home, you need to buy one of these.Read more
    ...Peace of mind at a good price!Read more
    Easy setup, affordable, simple app to use and OUTSTANDING support from the company. I’m buying one for each of my K9 transport vehicles.Read more
    ...feature and affordable since you only pay for what you use, it's inexpensive mind when you just want to check. Glad we made this choiceRead more
    41 customers mention power notification, 31 positive, 10 negative
    Customers appreciate the temperature and humidity monitor's power notifications, which alert them to outages and provide updates throughout the day.
    ...Notifications of loss of power, temperatures or humidity have gone outside of your set ranges, or with the water pucks, it senses water, you are...Read more
    ...Worked perfectly during a recent storm - showed when power went out, when it came back on and how the temperature dropped and then went back up....Read more
    Seems to work well. Notifications on power loss is the best because we purchased it to make sure the AC is working while we are out of the rv....Read more
    This is my second review, it gave me another false power out indication, now it wont power up at all, its less than 2 months old!I like that the...Read more
    30 customers mention notifications, 27 positive, 3 negative
    Customers appreciate the temperature and humidity monitor's notifications, noting that alerts are instant and work as expected, with one customer mentioning it provides advance warning of potential issues.
    ...It’s very easy to set up, and notifies you immediately when the powers goes off/on....Read more
    ...about power outages and the AC not working and this thing does a great job texting when the temperature or humidity go out of the range you set....Read more
    ...of our travel trailer while our cats are in it and it properly sent an alarm when the AC stopped working and the temperature crossed the upper...Read more
    ...Well, MarCell actually calls you! That means I can configure the ring tone and it comes in at full volume! Great feature!...Read more
    Other reviews are incorrect
    5 out of 5 stars
    Other reviews are incorrect
    This works just as described and it is great! This device is designed to alert you when the temperature or humidity goes out of your own set range. It is not designed to check status in real time at any given moment, however you CAN do that for $0.25 each time which is incredibly cheap. A subscription is required to use this device, and you can choose one month or one year or any monthly combination. I paid for the seasonal subscription, a four month period for winter in MI. Set your low threshold temperature higher if you want to be notified sooner that the temperature is decreasing. It cost $.25 per real time temperature check, not $2. The device checks temperature every 10 seconds and sends data to their server every hour for use in looking at your history chart later on. The data updates to your mobile/online dashboard every eight hours so you can see that. It definitely will alert you when the power goes out or the temperature or humidity exceeds your set thresholds.
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    Top reviews from the United States

    • 5 out of 5 stars
      Works well so far. Just to clarify some of the negative reviews' points:
      Reviewed in the United States on January 27, 2026
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      Works great so far. Bought it to monitor a house remotely that I am the executor of until I can get it sold.

      Just to clear up some information in the negative reviews:

      Yes, it requires a subscription. It uses 4G cellular. That's not free. You can pay monthly or buy a season or year in advance and save some money. Monthly = $14.95/mo; Seasonal = $11.95/mo (for 4 to 8 months); Annual paid in advance = $8.25/mo

      Why not wi-fi? Well when your power or internet goes out, so does your wi-fi. This device has 4G cellular and a battery backup so it works during internet and power outages. (Of course, yes 4G could go down in a hurricane, but you can't cover every scenario now can you!)

      (From the FAQ on their website): The sensor checks temperature, humidity and power readings every 10 seconds. If a reading exceeds your set thresholds, you’ll receive an instant notification. You can get notified by email, text or by their app. I like the text option. It's where I'm most likely to see the warnings right away.

      Live Viewing via their Website or App (Also from their FAQ): When you log in, readings refresh automatically, then update every 15 minutes while you’re active. The oldest data you will see on the web page or app will be 15 minutes old. For more frequent updates, you can purchase Instant Update bundles— $2 for 8 updates—to view the latest data anytime.

      I personally don't think "real time" is necessary if I have access to the latest reading from within 15 minutes. That's good enough for me. And again, if there is a temperature/humidity/power issue detected, you will still get notified immediately by text, etc.

      Minor cons:

      I wish the unit had rubber feet on the bottom. It is hard plastic and can slide off the counter easily. I will add rubber feet myself. You can also mount it to the wall using the holes on the back of the unit. Or use Velcro I suppose. They also sell a mounting bracket on their web site. And they provide the 3D printing plans for it (nice touch.)

      I initially had a problem getting a cellular signal until I moved the unit closer to a window. A rather normal issue with cellular service. Just noting it here.

      Amazon shipped me an opened, returned device, but apparently it was unused. That doesn't affect my review. That's Amazon's fault. Luckily the device worked fine, as I needed it ASAP.

      Overall though, very pleased with the device so far. If anything changes, I will update this review.

      5 people found this helpful
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    • 5 out of 5 stars
      Easy to use
      Reviewed in the United States on March 7, 2026
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      Affordable, easy to use and reliable! Thanks for a good product.

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    • 5 out of 5 stars
      Love it!
      Reviewed in the United States on May 18, 2026
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      Had this over the winter at my cabin in northern Minnesota. Worked perfect all winter. My heat went out once and it saved me from broken water pipes. It also told me when the power went out, and when it came back on a couple times. It's something I would not go without. Highly recommend!

      One person found this helpful
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    • 4 out of 5 stars
      Great, useful tool… but needs more frequent updating
      Reviewed in the United States on February 15, 2022
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      I bought this temperature monitor for my vacation cottage because our internet is spotty, so a wifi version is unreliable. Since we keep our cottage open all winter, it is crucial for us to keep track of the interior temps to make sure that the pipes don’t freeze. This unit is perfect for the job, since it not only runs on cell, but also has a battery backup. Recently, the temperatures in the area dropped to 17 below zero and the power was knocked out. We were able to keep a close eye on the interior temperatures of our house to make sure it never got below freezing. Fortunately the power was restored and the heat came back on, but if it had dropped too low, we would have been able to call a neighbor to get our generator going. So, the Marcell was really helpful.

      The unit was easy to set up and connected right away. I jus followed the instructions and it was up and running in minutes.

      The downside of this unit is that the reporting is only given every 6 to 8 hours or so. That means that in the event of an emergency, you might not know there is an issue or be able to see the trends until you trigger temp is hit and you get a text. During the outage, I ended up paying extra money to be able to get realtime data. It would be great if we could get hourly data like some of the competitor products.

      24 people found this helpful
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    • 5 out of 5 stars
      MarCELL Sensor
      Reviewed in the United States on May 13, 2026
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      The sensor works perfectly. The vendor's description, and the many reviews, accurately conveyed the device's features and performance. It's very reasonably priced and was delivered quickly. Very satisfied.

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    • 5 out of 5 stars
      Great product. At first I was a bit disturbed ...But after 6 months use, I am no longer. FANTASTIC
      Reviewed in the United States on December 2, 2017
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      Great product. At first I was a bit disturbed that the reporting isn't done in livetime--but in practice it's no big matter at all. If one of the values (temperature, humidity, power status) does go out of your own pre-established range, you get an immediate call or text message informing you of the same. Wonderful and comforting device and system giving me lots of peace of mind. Get it!

      Update 3/16/2018: I am always a bit suspicious of reviewers who review a purchased product a week after buying it. So let me update my original reivew from about 6 months ago and say: I wouldn't change a word. This is a great product and over this very snowy and very cold winter up here in New York State it has given me enormous peace of mind, day in and day out, living far from my blessed country home in rural New York. Occasionally I get a call from the monitor to tell me that power is out (and it IS!) and then, usually, another call a few minutes later to inform me it has been restored. If power is out for any length of time, I can send someone over who is closer to my home to investigate. If you live in a climate where 'climate' is increasingly becoming an issue--this is a cheap and fantastic method of monitoring a remote location. Again--get it, get it, get it. This is pure genius, so simple in conception and execution. Everybody who has a residence subject to the vagaries of climate deserves this device in their home.

      79 people found this helpful
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    • 5 out of 5 stars
      Great purchase
      Reviewed in the United States on January 16, 2026
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      Great product. I can monitor my cabin and have peace of mind nothing will freeze up. Very easy to setup and the monthly cost is minimal.

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    • 3 out of 5 stars
      Reliable cellular based monitoring
      Reviewed in the United States on September 23, 2022
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      I monitor the power and temperature of both my home and boat all winter. The subscription price is reasonable and uses a cellular modem to monitor temperature, humidity and power availability. If outside any of the adjustable settings I get a text alert. The app for my phone is easy to use and allows adjustments to the set points for notifications. History tracking and real-time readings are also available.

      Simple simple simple…. Plug in the monitor and it connects the cellular modem and starts to report as soon as you register your device. It’s perfect for monitoring our summer house and boat while we are away for the winter.

      3 people found this helpful
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    Product Summary: MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts

    From MarCELL

    4.5 out of 5 stars, 778 ratings

    Customer reviews

    100+ bought in past month

    About this Item

    • Best Value – MarCELL Subscription Plans for as low as $8.25/mo, nearly half of what our competitors charge. A MarCELL Subscription Plan is necessary since we operate on cellular networks.
    • Cellular Advantage - MarCELL can be used anywhere there is a Cellular Signal and continues to operate in power outages, unlike Wifi Devices
    • 24/7 Continuous Monitoring - Receive alerts via text, call or email when temperature and humidity levels reach critical levels, or power is lost
    • Real Time Readings - Whenever you check the webpage or app the readings will update (15 minute refresh after first reading)
    • Monitor From Anywhere - Use our intuitive app to view your readings at anytime, from anywhere. Review historic data and get instant updates on current environmental conditions

    Product Description

    MarCELL monitors and reports temperature, humidity and power. If temperature and humidity exceed or fall below the safe ranges you set, you will receive an immediate alert notification via text, call or email. Unike Wifi Devices, when power is lost you will also receive an immediate alert notification. Our online controls make it easy to set up your MarCELL with custom temperature and humidity ranges, alert messages, notification schedules and more. No complicated keypads or confusing displays. Just point, click and then relax! MarCELL is extremely versatile and can be used to monitor many different environments, including - Homes - RVs - Pet Safety - Greenhouses - Data Center / Server Rooms - Cold Storage - Warehouses - Vacant Spaces - and More. *As MarCELL is Cellular based, subscription plans are required, starting as low as $8.25/mo*

    Options Available

    Color

    • Home/Cottage
    • Pet Temperature Alarm
    • White
    Browse all available options

    Product Guidance & Documents

    User Guide (PDF)

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