Setting it up is a snap. First insert two AA batteries into the back of the monitor and two more into the remote outside sensor. Press the reset button on both and you should begin receiving data which is displayed on the monitor. Look for a suitable place to locate the sensor. A shady area is recommended for accurate readings. The maximum transmission range is 45 meters but that is in open spaces. Walls will cut down on the separation distance. A signal detector icon indicates how strong the connection is between the two devices. Using this will help you find the best place to put each of the two gadgets. The remote sensor is splash proof but it should not be exposed to heavy rain. I have put mine under the eaves of my garage. The monitor can be mounted on a wall or placed on any flat surface.
This particular model is perfectly suited for cold Canadian weather. The remote temperature sensor is good for -50°C to 70°C (-58°F to 158°F). The main difference between this monitor and the competition is that this model provides decimal temperature readings, which is a rarity. A temperature of 16.6°C to 17.4°C would register as 17°C on most monitors. I appreciate this precision because I am sure I can tell the difference between these two readings. On the monitor there is a battery indicator icon, letting you know when the power is starting to go. The batteries should last about 12 months.
Besides the indoor/outdoor temperatures, the monitor also displays the outside humidity and a “Humidex” index to indicate how comfortable/uncomfortable the temperature really is outside.
— Marcel Dufresne
Thermor Bios Indoor/Outdoor Humidex Thermometer $32