A safety lancet for taking blood has a hollow barrel with two first slots and two second slots and a detachable needle hub. In one exemplary embodiment, for instance, one or more deterministic test values for testing targeted faults in an integrated circuit design are determined. The insulating base includes a holding portion. In some embodiments the delivery devices may be loaded with one or more desired substance before their introduction into the body. The inner core has an interior hardness and a surface hardness differing from the interior hardness by greater than 20 percent. The durations of the measuring pulses are corrected according to the change in the duration of the reference pulse.