Wired 1.3" LCD Outdoor/Indoor Thermometer/Time - Random Color (1 x AAA)

Pros: Very good, with large display. Has an easy front external °C/°F switch. Uses a cheap and easy avaiable AAA battery. Has an easy buttom to power off (press for few seconds) which acts as a circular switcher between indoor temperature -> outdor temperature -> time. Has a good 0.1C accuracy

Cons: The manual comes in chinese, not english, as stated, but the use is very straighforward and a manual is not necessary.

Other: Cheap and good! Buy it!

Pros: Works nicely on one AAA type battery (not included). There are actually two temperature sensors: one is built-in into the enclosure (the device itself). The other one is built into a small metal tube at the end of a thin wire. This makes it possible to position the device indoor somewhere, and place the secondary sensor outside by routing the wire through a windowsill, for example. A leaflet with some instructions is included, in English. There is a switch for choosing Celsius or Fahrenheit. The temperature is displayed with one digit after the decimal point.

Cons: The thermometer is not extremely accurate. It is only fairly accurate (but the device does display one digit after the decimal point, which it probably shouldn't, because the measured temperature is not that accurate). This fact is also stated in the documentation that is included, by the way. Placing the external sensor next to the device yields two different temperatures. However, there is not more than 1 degree (Celcius) of a difference.

Other: Good quality for the price!