This pocket-sized Ethernet LinkCheck Tester weighs only one ounce and can be a handy tool to check your Ethernet connection.

With just one click of a button you will know whether you have a connection and if you have whether it is 10MB or 100 MB. The LinkCheck can be used to test for the presence and speed of standard RJ45 plug.
The tester is just 3.5-inches long and indicates the status of the Ethernet by easily readable three LED located on the device. The dimensions of the device are 3.5-inches x 1.1-inches x .65-inches and come with six months of warranty.
This device has the potential and the capacity to save your time and can be bought for $40.
Via: Gizmodo