A compact catalytic reactor defines a multiplicity of first and second flow channels arranged alternately, for an endothermic reaction and for an exothermic reaction respectively, and each containing a removable fluid-permeable catalytic insert to catalyze the reaction. In a described implementation, a mobile-friendliness indication is determined for an internet site. Measurement of end point of cooking of dhals, rice etc is very subjective and current methods are not very satisfactory. 0 g or more, and the total weight of indium and bismuth is 450 ppm or less with respect to the weight of zinc. The tube connection of the test container in each case has a distributing component via which a fixed tube connection to an associated nutrient medium container is formed and can be used to feed an associated nutrient medium to the test container. The combination of the input from the operator and the sensor indicates the direction of the vehicle.