A weather resistant modular sensor and computing platform reduces costs and enhances versatility of sensor systems. A log of write time information and write temperature information from one or more write operations is stored in a data unit header. By increasing the Cu concentration, the Al\u2014Cu alloy film forming the bonding pad is hardened. Therefore, when the solid electrolyte is formed on the flattening layer, the solid electrolyte is prevented from any depressions and bulges on which stress is concentrated. The intermediate portion also includes a grip projecting outward from the front surface and preferably the rear surface of the climbing wall. The process prevents toxic levels of the agent from entering the body’s general circulation while delivering lethal doses of the agent to the lesion.