When leveling a network or testing a CATV device, an attenuator is needed, which has a wide value range and can be set in fine enough steps. The ECSATT provides regarding to this a maximal value of 50 dB with 0.5 dB step size. The device is realized in an easy-to-use handheld housing, while the powering is based on the built-in battery. The setting can be done either by typing in the desired value or by stepping. The unit is equipped with a USB port for the battery charging, and provides an option for controlling the attenuation by a PC.