A rotation locking device located in the area of two separate, independent shafts or shaft sections for preventing the undesired rotation of a shaft or shaft section. The latter, in operation, delivers PWM pulses having a controllable pulse duty ratio and a substantially constant frequency. The system provides a configurable increasing level of financial service based on a Methodology Publisher’s configuration for reference date based investments. This new and distinct variety has shown to be uniform and stable in the resulting generations from asexual propagation. The method and apparatus allow an accurate depth profiling of a test sample to be performed.