A system and method is provided to reduce particulate and NOx emissions from diesel engines through the use of a duel-fuel fumigation system. For each device, a configuration module configures a first display to combine with one or more additional displays of one or more additional electronic computer devices to form the larger display. The clip system providing means for re-positioning an attached animal, or the like, without the addition of other devices and without un-tethering the animal, even momentarily. In some embodiments the coefficients of thermal expansion of the metal support and the lamina are within 10% or within 5% of each other between the temperatures of 500 and 1050\xb0 C. Accordingly, these porphyrin derivatives are extremely useful as NIR PDT fluorescence sensors in photodynamic therapeutic and diagnostic, biological and industrial applications. Embodiments include spacing the ultrasonic sensors more closely at the lower end of the probe, offsetting the sensors to enable tighter vertical spacing, matched pairs of sensors for redundancy, and a downward facing sensor located at the lower end of the probe to decrease the minimum liquid level that can be accurately measured by the probe.