Review on iBetterLife 2 Pack Digital Waterproof Wireless Refrigerator Thermometer with Large LCD Display -20 to 60 Degree (-4 to 140 F) for Indoor/Outdoor Monitoring by Tres Carmon

UPDATED: These things are HORRIBLE. Even worse than the first reviews. 2 has completely failed in less than 2 months. The temperature readings from 4 of these units are next to 2 known accurate thermometers (which have been repeatedly tested to agree with each other within the same range) and NONE agree with working thermometers or with each other. The deviation of the readings has increased to 15 degrees (i.e. if 2 good thermometers read 5 degrees, these will read anything from 10 to -5 degrees, and neither of them will match any other thermometer - well, it did, until 2 of them completely died.). I've even tried replacing the batteries, but the thermometers are dead, not the batteries (which strangely still show normally on my multimeter). check the temperature inside. Knowing it's possible to get a bad block in one order I bought 4. I figured this was to guarantee that at least 2 would have an accuracy within 1 or even 2 degrees. I had two other thermometers available that seem to fit. I was and am quite disappointed.1. These thermometers cannot read accurate temperatures. I have used several other thermometers. I wanted some to stay in the fridge and freezer for a long time. If you put 4 of these in the same section, you get 4 completely different temperatures. 1 degree is fine. Maybe even 2. If the internal temperature was 35 or 37 degrees Fahrenheit instead of 36 Fahrenheit, our food would still be safe. 42F instead of 36F is not that much. >40 degrees means damage when heated. 29F means frozen spoilage. So a deviation of 3-4 degrees (or more) is actually completely useless, and they are constantly in the same place on the whole map with a difference of up to 8-10 degrees from each other. one is correct? any right? Useless crap.2. These thermometers are slow so they don't read changes due to opening the door. When I say slow, I mean that 30 minutes in the medium is not enough to guarantee that they will level off. These thermometers can only be read when you are level with them and looking dead on the LCD. If they are visible, fog them up. Garbage! All in all, these things are terrible for their purpose. I can't comment on their longevity, but I suspect that when they don't meet immediate needs, the longevity is fantastic. ETA: It's been in the same place in the fridge for 3 days. The temperatures of all 4 blocks are still read differently: 36.1, 37.3, 40.1 and 40.6. What is right? These things are TERRIBLE.