For the less hack-inclined, I highly recommend looking at the https://SensorPush.com https://SensorPush.com devices after researching a bunch of wireless remote

For the less hack-inclined, I highly recommend looking at the https://SensorPush.com https://SensorPush.com devices after researching a bunch of wireless remote thermometer options (including a couple marketed for cigar humidors). Bluetooth to (multiple) phones, replaceable battery that should last ~1 year, available Bluetooth-Wifi gateway to let you set up a whole monitoring system, $50. For the Samsung fridge getting ice buildup, there are relatively few causes and likely the simplest is the same defrost timer mine had issues with. I like https://repairclinic.com https://repairclinic.com for appliance parts, though they don't have any of the 3 models of Samsung defrost timers in stock right now.