An oilfield apparatus has a swellable elastomeric composition that includes a swellable elastomer and one or more nanosensors dispersed therein. According to the present invention, it is possible to find simple and effective ways to deal with technical problems arising from the large variability of the pump-by-pump operation characteristics and the multiple process conditions where pumps run under the idle operation and gas-loaded operation conditions alternately, especially in semiconductor manufacturing process. An implantable or other ambulatory monitor senses a pulse amplitude signal such as a vascular plethysmography signal. The game components may be based on an individual chapter from a published children’s book or novel. The relief may be in the form of a decorative design or the like.