A device for sampling body fluid, the device comprising, a main body, a lancet disposed within the main body, a carrier disposed within the main body fixedly attached to the lancet, a biasing means in communication with the lancet and the carrier, an annular space disposed within the main body adjacent the lancet, and a means for measuring a body fluid. The apparatus is characterized by a central vacuum system operating over one or more independent vacuum chambers ; said vacuum system being composed of at least two vacuum subsystems, connected to the chambers by means of independent manifolds. With a higher excitation frequency relative to the main armature current frequency, a steady main field voltage can be achieved which improves stability control while in the starter mode. The buffer memory is configured to provide temporary storage of the data that is stored in the specific memory cell during the testing of the specific memory cell. The transformation is performed based on the type of authenticator node and type of UEidentity module with which the transformed key is to be utilized.