Bone cages are disclosed including devices for biocompatible implantation. The block member and a stationary platen fixed to the base are connected by means of connecting members. By turning on again the switching transistor 4 after a lapse of a prescribed time from turning-off of the switching transistor 4 and by connecting the data line 6 to an integrator 10, the holding capacitor 3 and the parasitic capacitor 8 are discharged, and a discharged amount of charge is detected by the integrator 10. Additionally, the customer attributes can be assigned to a customer based on a contract level associated with the customer, or based on an application type intended for use with the customer contract. It is useful for a variety of semiconductor applications, particularly for DRAM gate dielectric layers and DRAM capacitors.