Price on Amazon: $49.99
The SensorPush Thermometer has all of the same capabilities as the previous thermometers — it takes temperature, reads humidity, stores history, and connects via Bluetooth — but the main difference lies in its size.
Whereas the other devices listed are around three to six inches, this thermometer is tiny and discreet, measuring about an inch and a half long on all sides and less than an inch wide. Thus, it can be placed anywhere discreetly.
SensorPush lets you set up alerts for when your temperature reaches a certain threshold, but unfortunately, because it's connected to your iPhone app through Bluetooth rather than Wi-Fi, you need to be within the device's range.
SensorPush is a bit more expensive than some of the other options, but it has 4.4 stars on Amazon, with many perfect five-star reviews.