AcuRite Matte White Digital Wireless Fridge and Freezer Thermometer for Home and Restaurants with Alarm and High/Low Temperature Records (00523M)

Had a frig that was 5 years old. Milk was going bad faster than usual and frost building up in the freezer. Had a tech come out but of course the frig was fine, temp was fine while he was here. He told me about these temp gauges to keep track to know when it was time to replace the frig.Got them, put them in the frig and freezer, and then watched the temps go way too high. So, replaced the frig not long after we bought these.Have them in the new frig/freezer. Not going to be surprised next time!They are small enough to not notice them inside the appliance. The panel that shows the temps just looks like a thermostat, have it on the side of the frig where I can check whenever. Tells you the min and max temps both have gotten to for the last 24 hours, and the current temp which is the largest numbers in the middle of the screen. The numbers show to the tenth ex 1.4 or 37.8One side of that box slides down a bit- magnet not strong enough, so I put a small magnet under it and it keeps it straight.Also the pieces come with suction cups, I didn't use them, but smart idea, they have loops on the top of them for the cups.Your frig may tell you the temps it is set at, but that doesn't mean that's what the temps are in the appliance I have learned.I'm guessing we will always use these.

First, I want to correct a statement in another review about the display not sticking to the refrigerator. I find that it sticks very nicely. Perhaps it would not work on the door because of the vibration of opening and closing, but the magnets are plenty strong enough to hold it in place on the side.When I first received the unit and got it set up, I put both transmitters next to each other in the refrigerator so that I could get an idea of the accuracy. I also have a very accurate Govee sensor for reference. A nice thing about the AcuRite unit is that it allows one to make calibration adjustments (which I did for one of the sensors, which was perhaps one degree Fahrenheit off). In short, the accuracy of my units was entirely adequate, especially with the ability to calibrate.I do wish that it had at least a BlueTooth facility so that one could get warnings on one's phone. Even better would be a WiFi connection so that one could get warnings no matter one's location. In my case, the Govee sensor in the refrigerator provides that service adequately.One other comment: I wish that the product description included the information that the freezer sensor needs Li batteries in order to work at the very low temperature. Had I know that when I ordered the AcuRite unit, I would have ordered the batteries at the same time. (This problem was mimimized because Amazon was able to deliver the batteries on the same day, and I had the unit up and running the next day.)

I have tried at least 4 different fridge/freezer alarms over the past 6 years since our fridge died in the middle of the night and we lost a whole bunch of food that spoiled before we realized that the compressor was no longer working.This is the only sensor/alarm that has not given any false alarms (nothing like being woken up in the middle of the night for a false alarm). It is also the only one that has not had any communication drop-outs.But the biggest positive for me is that you can set each sensor and each base unit on one of 3 frequencies. So, you can have three base units with two sensors each and each of them will be separate and will not interfere. So, you set two sensors and one base to channel A and two more sensors and the second base to channel B and the last two sensors and the third base to channel C. No other sensor/alarm that I have purchased worked this way. All additional sensors and base stations were on the same channel and would interfere with each other.So, if you need to monitor more than one unit (we have a main fridge, a garage fridge and a chest freezer) then you can buy multiple units and monitor up to 6 separate devices.Also, the sensors for the white premium unit (00523M) and the silver premium units (00515M) are interchangeable. The base units are the same, just different colors.

I've had two of these for a few years now (originally got one for the kitchen fridge, then bought a second unit for the deep freezer.) The pluses and the minuses are below.First, the minuses:The first thing is that this is supposed to be able to stick to your fridge magnetically. But, they cheaped out on the magnets. The magnets in the back are NOT strong enough to hold this device onto the fridge. The motion of the door makes it fall off, and when not falling off, it is gradually sliding down. We added some heavy-duty magnets between it and the fridge to keep it on there.The second thing to know is that the freezer sensor on the first one I bought went bad, after less than 2 years of use. You can't buy replacement sensors, so I ended up buying a whole new unit. I hope that this is a fluke, and the current units last longer. I will update.The pluses: I have a temperamental refrigerator. It came with the house and it still runs so I would rather use it than replace it. But it's very responsive to changes in barometric pressure. Sudden cloudy or rainy days? The refrigerator temps drop and things freeze. An engineer friend explained it to me once but I don't really understand it, I just live with it. I like having the temperature display on the front of the fridge so that if there's a problem, I can see it right away. I also like that this device has a safety alarm if temps get too low or high. The device works for that. The batteries need replacement every 6 months or so.

We just experienced a power outage that lasted several days. These thermometers allowed me to monitor our fridge, freezer, and chest freezer temps over the course of the outage without having to open the doors and waste energy. This helped me to prioritize where our backup power was needed most and likely saved me from having to throw away alot of food. In an unrelated case I was alerted to a temperature rise in our refrigerator due to a blocked vent. These units are well worth the cost.