Installing satellite receivers is a very delicate job. The receiver has to be aligned as closely as possible to the satellite for the best signal quality, so you get excellent picture and sound reception. To get this done quickly and smoothly, technicians use signal level meters. They detect the desired satellite automatically and display the signal strength. Some models can also show the live picture directly on the device. This means you can check the quality of the work immediately. It is not necessary to be able to see the television. Powered by a rechargeable battery or a power supply, the meter can be used virtually anywhere, be it on the roof or out in the open.