AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm, Max/Min Temperature for Home and Restaurants (00515M) 4.25" x 3.75"

We have three chest freezers, two of which are out of sight in the basement and full of veggies from the garden, venison from the property and meat from our nephew's farm. The concern has been losing either one, or both if the GFCI trips, and their contents. One freezer is about a year old and the other just a couple months. I saw this system recommended on a FB group and the Amazon reviews seem favorable. So I decided to give it a try, especially since it has a WiFi connection, so the information display can be in the house, and an alarm. We can check the freezers' status at any time and the alarm will warn if we have a pending disaster. It arrived well-packaged. The box exterior is plain cardboard with a plain label just at one end. No fancy marketing! I ordered four AA Lithium batteries at the same time for the sender units, which are recommended by the manufacturer for use in freezers. After installing standard 'Copper Top' batteries in the display first, then the lithiums in the sender units, the temperatures of each sender unit appeared on the display immediately. They were the same at about 72F. To me, the instructions were clear, though it probably does help to be mechanically-inclined! I set the alarms for min and max temps and took the sender units down to the freezers. I hung them on the baskets with tie wraps as the included suction cups wouldn't have stuck on the dimpled freezer walls. The Amazon photo showing the silicone loop wrapped around itself is not very practical as the loop is small compared with the size of the sender unit and you'd have to really stretch it. Too much effort in the depths of a full freezer! When I returned to the main floor, the alarm was sounding. The displayed temperatures were slowly going down as the sender units adjusted to the freezer internal temperatures, but were higher than my max temperature settings. I pressed the "Bell" button to put the alarm to sleep. The display seems to update every few seconds, not instantaneously. After a few minutes, the displayed temps reached the freezer internal temperatures, which were just below 0 deg F. Each reading was slightly different due to being in different freezers of different makes and settings and the temps vary anyway within a few degrees as the freezer compressor cycles. 0 deg F is what is expected though for a chest freezer. I have my alarm settings at -20F and 15F for both freezers. The alarm won't go off for a few minutes if it reaches those temps. This avoids alarms when the freezer lid is opened to put in or take out food. The signal display was indicating max. strength with the display unit maybe 20 ft (straight line) away from the freezers on the floor above. Moving at least double that into the kitchen, where the signal has to pass through a thick natural stone wall in the basement, as well as the floor structure and around various steel/wood heating ducts in the floor, the strength was still high. I was impressed, considering the sender units are also inside a cold, metal box! The two small magnets on the back upper corners of the display unit, aren't quite strong enough to hold it firmly onto the refrigerator door. It slides down as the door is shut and there's a risk of it falling off and being damaged. I have it sitting on the dining room dresser, where it's out of the way, but visible. It could also be hung on a nail on the wall. While a little pricey compared with other similar units (with more 1 Star reviews!), $35 is a small price to pay to avoid spoiling all the valuable food that is in the freezers! So far the system is performing well and to design. I will update should anything go wrong! UPDATE: Several months in and the system is working just fine. After the first week or so, I noticed one of my freezers was 10 degrees or more colder than the other and unnecessarily so. I adjusted it and now I have comparable temps, though the later-purchased freezer has a wider range of temperature fluctuation , due to a less precise control system. Very pleased!

Usually I find some little annoyance with consumer-grade devices but system has given me no problems and all the promised features I use have worked flawlessly. I only noticed one time when I first set it up that it lost signal with one of the sensors but it automatically reconnected after about 30 seconds with no manual intervention (like reset or reboot). No other issues noticed in the rest of the six months I had it installed. The min/max function is great because you can see if there were any problems between when you looked at it last. This is also very helpful if you have a new refrigerator and you are trying to get the settings perfect. I would also think it would be useful for a fridge with electronics to make sure they giving accurate readings. Note that used lithium batteries instead of the included alkaline as, according to the instructions, they perform better in low temperatures. I cannot comment on the alarm feature as I have it disabled. The magnet on the display is decently strong and it hasn’t moved around at all even with repeated door open and closing. The controller color is grey/silver and looks great on my stainless fridge. Probably would look good on most other colors too. The current temperature readings are large enough to be seen from about 10 feet with decent vision and lighting but the display itself is not lighted (which makes sense as it runs on batteries). Highly recommended!

I bought two of these because I wanted to monitor three areas: 1) the fridge compartment of my refrigerator, 2) the freezer compartment of my refrigerator, and 3) a deep freeze located in my kitchen about 15 feet from the fridge. I bought the first thermometer about 18 months ago and added the second unit a month ago. Here's what worked well: - The temps are accurate enough based on comparing with a couple of analog thermometers I have, with only a degree or two difference here and there. - The alerts are simple to set. - The alarms are loud enough. I can barely hear them upstairs in my bedroom, but I can hear them. If I'm awake, I can hear them anywhere in my house. Here's what did not work well: - There is a conflict between the two base stations and the four remote units. I've deployed both freezer remotes plus a single fridge remote. The freezer remotes each paired with their respective base stations, but the fridge remote paired with both. Not a bit deal to me--the fridge remote on my deep freezer base station is just a duplicate of the fridge remote. But if you have two fridges with freezers, you might wind up running into issues keeping the devices separate. The biggest issue I have is the alarm setting for my fridge's freezer. My freezer has a defrost cycle that heats up the freezer compartment to around 16 degrees for a very short time before rapidly cooling back to -10 degrees or so. My understanding is that this behavior is normal, and the food stored in my freezer will not be affected due it it's being frozen solid and the short duration above 0 degrees. But this of course means that I can't set my freezer remote alarm to the 0 degrees the FDA recommends as a minimum freezer temperature. The best that I can do to take advantage of the freezer alarm is to set it for 16-ish degrees in case my freezer completely fails. Overall, I'm happy with these thermometers. They have worked reliably so far. In fact, this alarm notified me last month that my freezer was too warm. Turned out the defrost wasn't working and the coils were iced up. I don't see any way around the daily temperature spike due to my freezer's defrost cycle, so I can't blame this device for not being able to tell if operation is normal or not. Actually, what would be great would be a freezer whose thermostat is tied in to the defrost process so it would know what acceptable temps are during normal operation and during defrost cycle. It could then send appropriate alarms.

UPDATE !/16/25: Still working great! But I just wanted to tell you that I bought a second unit for the bedrooms so we can check temps from the living room. You can't use a second set because it picks up the sensors in the fridge and freezer, even though I have batteries in the two new sending units which are I the bedrooms. So I have been using the monitor in the living room to keep an eye on the fridge temps. But now one of my friends has had a few power outages, so I'm going to give the second set to her. I am so glad I got this item. Now I can track the temp of my fridge and freezer without opening the doors! It was a simple matter of inserting batteries and placing the sensors in place. I have the monitor on the side of my fridge via the 4 magnets, but you could also hang it on a nail with the hole on the back. The sensors take 2 AA batteries each, and the monitor takes 2 AAA batteries. I used regular alkaline batteries (Duracell). I opted to not pay for expensive lithium batteries. So far, I have had no problems. I had a power outage in the recent past, and would have liked to know what the inside temps were in my fridge (without opening the doors), so I would know when to go get ice. The suction cups did not work, the sensor units fell within seconds of placement. I did not clean the wall prior to placement, so that could be a factor, but I would rather have them sit on the shelf anyway. On the back of the monitor, you have a switch for Celcius or Fahrenheit, as well as a reset switch. I do not use the alarms. You have to program the alarm settings if you want to use them. You can reset the hi and low reading by simply pushing the "clr" button. *** UPDATE 9-26-17 *** I had a 10 hours power outage about a month ago. This acurite unit performed FLAWLESSLY! I monitored the fridge and freezer temps constantly, and when the temps got too low, we went out and got bags of ice so we could put all the food in an ice chest. Then I put the sending unit in the middle of the ice chest to make sure the temp remained low enough. I can't love this item anymore than I do right now! Worth every penny in my book. NOTE: I still have the same batteries in it, and they are still going strong. I do not use the alarm. But I do check the high and low temps every morning and then reset, and I check and reset at bedtime. My freezer temp ranges from -5 degrees (f) to 10 depending on how much we open the door. It does not seem to affect my Duracell alkaline batteries. Very happy I did not pay for lithium batteries. UPDATE 8-27-18: This unit is still going strong! I recently replaced all original batteries (at about 8 months in), even though they were working just fine. I wanted to make sure the batteries did not die when I had a power outage. This is the best unit. UPDATE: 11-15-23 Still going strong! I can't tell you how many times this unit has helped during power outages. We don't turn the generator on until the fridge hits 40 degrees. We are constantly checking the temps day and night for piece of mind. I'm going to buy another set to measure for cold drafts in the bedroom. Two points of reference, one display. I'm amazed how many years we have had this, and it still works.

REALLY like this device, but there are two things you must be aware of that will affect functionality: 1 - One unit is designed with a temperature range for the fridge, while the other is designed for the freezer. Make sure you know which is which before inserting batteries and placing them. 2. The freezer remote has a different battery need than the fridge. Alkaline will work fine in the fridge unit, but it's too cold in the freezer for alkaline; you need a lithium-ion battery for it. Lithium-ion will certainly work in the fridge unit though. In general, though, the base unit was easy to set up. looks nice, and sticks firmly to a magnetic surface.

tl;dr version: This works fantastic for monitoring a standalone freezer in the basement. Full story: We have a standup refrigerator-sized freezer in our basement (mainly because that was the only place in the house we had room for it). We've managed to leave the door cracked open a total of 3 times now in about 10 years, due to simple negligence, and have lost hundreds of dollars in spoiled frozen foods as a result. There's no reason this needs to ever happen, so after the last time a month or so ago, one part of my fix was that I wanted something to sound an alarm if the temperature rises too much. Enter this simple wireless temperature sensor. Since the use case here is for a single-chamber freezer, and our fridge is well out of range 1 1/2 floors above on the other side of the house, I opted to just put both sensors inside the freezer. One is on the top shelf of the door, theoretically the highest temperature inside the freezer and the first location to start thawing if the door were left open. The other is buried deep on the bottom shelf near the back, which is theoretically the coldest area of the freezer. This way I get an idea of the effective range of temperatures throughout the freezer at any point in time. In case anyone's curious, there seems to be a fairly consistent 15F degree difference between the two sensor locations, plus or minus a few degrees. Installing the batteries and connecting the sensors to the display unit was quick and effortless. I didn't have any lithium batteries on hand, so despite the freezer being below the optimal range for alkalines, I went with what I had and gave it a shot, knowing I could just go pick up some lithiums the next day if it didn't work. So far the sensors haven't had any battery issues despite the subzero temperatures. Placing the sensors inside the freezer was also easy, although I couldn't make use of either the suction cups due to the low temperature or the wire shelf straps due to the shelves being thoroughly encased in frost and ice. That said, having them just sit on the shelves seems to work fine. The display unit is magnetically stuck to the front of the door and has had zero issue so far with the signal from the sensors punching through the metal frame. Both sensors show a very strong signal indicator. I have not had an opportunity yet to test the alarm feature. I did reprogram the "refrigerator" sensor's alarm range to freezer settings and turned on the alarm for both. As pointed out in the manual, while one sensor is labeled as fridge and one as freezer, they're otherwise identical and you can adjust the alarm range for each one independently. You're also not limited to just cold temperatures - the nominal max is 158F/70C although the display only goes up to 99.9 in Fahrenheit mode - so you could easily monitor something other than a fridge and/or freezer with this if you wanted to. Anyway, one of these days I should probably take one sensor out of the freezer for a while and let it warm up just to confirm that the alarm is audible from another room. Overall, I'm very happy with this purchase, especially considering the reasonable price.

I am so pleased with this thermometer and its sensors. I purchased it because the freezer failed on my 7 year old refrigerator, and I didn't know until it was too late to save the food in it. So several hundred dollars later, I am up and running again, but this isn't going to happen a second time! I found that setting everything up was a breeze - except the thermometer readout kept saying 71 degrees in the refrigerator and 70 in the freezer - it wasn't even that warm in my house! So I emailed the company, and never received a response - nice! But finally a light bulb went on in my head and I hit the "reset" button on the monitor - and then it started working just fine. You do need to use lithium batteries in the freezer sensor for the best performance. And I found that the suction cups simply don't work for more than a minute or two, so each sensor is clipped in place, which is not a problem, since the sensors come with built-in clips. As far as accuracy, I have no way to test, but it does show very satisfactory readings in both refrigerator (39 degrees) and freezer (3 degrees), on the Power Saver mode. That works for me. I think the thing I like the most about this monitor is that you can tell what the temperature is inside the unit WITHOUT opening the door - before I had one of those cheap dial thermometers that hung on the freezer shelf, and you had to open the door and really squint at it to see how cold it was in there (or not, for awhile, until the repair guy got here!). Well, I have learned my lesson and I consider the money I spent for this monitor to be an investment in making sure my refrigerator and freezer are running correctly and that the food is safe to eat! I almost forgot - each sensor has a "minimum" and "maximum" temp setting so you can see if any temperature variations have taken place recently. And there is an alarm for each sensor that will go off if the unit gets above your preferred setting for 15 minutes, but I have not yet set them up - I'm still cleaning up after the freezer disaster! Even if you're not having trouble with your refrigerator and/or freezer right now, you should get this monitor, because - believe me - someday you WILL, whether it's a power outage, or a fan goes out, or whatever. At least with this you'll have an early warning system before your food goes bad. I've been there for the past week, and you do NOT want to go there - it is very, very expensive!

I've had this in my garage freezer and house fridge for a couple weeks now, and they seem to be reasonably accurate, reading within a degree or two of my mechanical fridge/freezer thermometers. Keep in mind that these are measuring the air temperature, so the readings do fluctuate more than the food temperature. For example the food in my fridge is stable at 35*F, but the thermometer will show about a 10*F fluctuation as the fridge cycles on and off. You will need the lithium batteries for the freezer especially, otherwise you will get a constant low battery alert flashing on the screen since other battery chemistries can't handle the sub 32*F temps. Overall, these seem to be working just fine and I can see that my freezer in the garage is working properly which is my primary concern since I don't get into that freezer more than maybe once a week. The silicone loops make it easy to hang the sensors wherever you want without taking up storage space. I would buy this unit again. The price is reasonable, as is the accuracy for my needs. My only complaint is that it only shows a 24 hour history. It would be nice to have a longer term history, say 30 days or all time min/max, but thats a pretty minor gripe.