A method of actuating a valve in a well can include storing energy as a result of a differential pressure across a closed closure device of the valve, and releasing at least a portion of the stored energy while opening the closure device. To achieve these objects, a method is disclosed in the invention for measuring the electrical potential distribution on the sample with a static electrometer while loaded by a loader mechanism. And the integrated receiver is particularly suited for small, portable devices and the reception of terrestrial audio broadcasts, such as FM and AM terrestrial audio broadcast, in such portable devices. The second monitoring assembly includes an ear canal microphone to monitor an acoustic field within the ear canal and produce an ECM signal. With such an arrangement, only one threaded rod with a driving device is needed to actuate the tool holding device and the working piece-clamping device to operate.