Digital thermometer: 3D-printed thermometer from MakerBot article Significant digits: A digital thermometer is a 3-digit digital clock with 3-dimensional numbers.
They can be used to record and display time and temperature.
They are also popular in hospitals.
Digital tv antenna: A TV antenna is a small, rectangular device that attaches to a digital TV.
These devices can be connected to the internet and have an on-off switch that is used to set the channel to a channel of your choice.
Digital TV antenna: The cheapest option.
It costs around $20 but has a small LCD screen.
There are also cheaper ones on the market, like the $9.99 Nest thermostat, which has a TV antenna.
Source Mashable