Ambient Weather WH51RF Refrigerator Freezer Sensor | Up to 8 thermometers per compatible station. Max quantity 8 can be any combination of WH31E, WH31P, WH31PF, and WH51RF

I purchased two of these for an older refrigerator/freezer unit to make sure the thing doesn't shut off or malfunction and waste hundreds of dollars worth of groceries and have yet to have an issue with either of them. Easily connected to my Ambient Weather ws-2000 wx. station, allowing me to see the exact internal temperatures on my app at any time. No issues whatsoever working from within the refrigerator with no wires, transmitting data to the receiver on the opposite side of the house. I used a thermometer to ensure accuracy & they were accurate to with 0.2°F.

Made well, easy to set up. Have 7 of them, when setting up most showed the same temp. a few were 1 degree off. Range is excellent one reads from inside a refrigerator in detached building and another in a greenhouse. Highly recommend.

*** Update 9/9/24. We have had a couple of incidents where we thought the freezer was closed. It LOOKED closed. But it wasn’t completely. Today I got an alert the freezer temperature was at a certain point I set the alert up for. I had just been in it getting something for dinner. Went back down, sure enough it LOOKED closed, but it wasn’t. So happy I got these! So far at the time of this review, I’m impressed. It’s been working for about 9-10 days and I like what I see. My console is currently on the 3rd floor, and the sensor is in a standup freezer located on the first floor and no connection problems whatever. I bought it because recently we had a problem with a power surge that took out our Verizon box, and our freezer was on the same outlet. We had no idea the freezer was down (although we saw pretty quickly the internet was down! LOL). Luckily we caught it and ran an extension cord to the freezer since the outlet was blown from the surge. Based on the readings, I can even tell when someone opens the freezer to get something out! I’m buying two more sensors for my refrigerator and freezer in the kitchen!

I have this in a deep freeze that is used to store processed meat including venison. I was worried about the signal strength passing through a metal freezer and across the house since freezers can act as a faraday cage. It has a strong signal and works perfectly. Note that I am using Energizer Ultimate Lithium batteries since they work well in freezing temps. I can see the temp on my WS2000 display and can also see the temp as well as historical graphs with the Ambient Weather website/app. I am watching the data and have set it to send me a notification if it reaches a temperature slightly above the highest temperature it hits during routine cycling and defrost. I am sharing my weather data online and have also confirmed that Ambient Weather and Weather Underground do not share data from this sensor online. It does not even show this sensor at all from public view, but I can see it when logged into my AWN dashboard. I am very happy with this purchase! I feel it is well worth the investment since losing a freezer full of food would be many times the cost of this sensor.

I purchased 2 of these to work with my Ambient 2902B console. I placed one in the garage deep freeze and one in my refrigerator to monitor--just in case. Within 3 weeks, my first alert went out: the refrigerator door didn't close because the bottom drawer wasn't completely shut, and I got a text message that alerted me that the temp had gone above 45° (my preset high temp). Did it save the day? Maybe...but temps are consistent and accurate. It's also cool that I can monitor my temp monitors from the Ambient Weather PWS page and on the app! Temps are accurate within ±1.0°, according to the mercury thermometer I use to calibrate.

Accurate & can easily connect to the base station.

Pros: Easy to setup even with the weather station's retro 1990's VHS player-style interface. Works well in deep freezers with rechargeable Eneloop batteries. Provides data points over time which are useful for food preservation. Cons: The WS-2000 can't be programmed to trigger a console alert for this particular sensor, which is bananas considering this is the sensor that most consumers would find such a feature the most useful. The app can be setup to send a SILENT alert if the temperature falls outside a programmed range, but it won't send an AUDIBLE alert (like noise from the app or a text message) unless one pays for a subscription in the app. Not all of us take our phones out, log in, and check for silent alerts on a regular basis, and by then, food could be thawed or thawing. This just happened to me. The workaround is to set the app to send both a push notification and an email, and then configure the phone to make an audible alert if an email from ambient weather arrives, because their app will remain silent. The sensors are expensive for what they do, but they are reliable. I understand they have a monopoly so only their sensors can integrate with their systems so they can charge whatever they want, but it would be nice if they offered a cheaper version that didn't include a humidity sensor since I find that information irrelevant for a deep freezer. In summary, it's a good (and spendy) product that includes a humidity sensor at additional cost that most of us don't need for inside our freezers / refrigerators, and there is no way to trigger an audible warning without paying a monitoring fee or reading this review to learn the workaround.

Use to monitor my deep freezers and refrigerators. So far working very good. Has saved us once when a fridge door got left open.

Worked perfect with my Ambient 2902-c. Set the channel and added it with no issues. Use it in a upright freezer on a different level, no issues.