A process for preparing a metal oxide catalyst for acrylic acid production which comprises calcining a metal compound mixture at 400 C. The antenna includes an antenna array and a first BUTLER network. The composition comprises A) a nonionic water-soluble etherified polysaccharide and B) water andor a lower alcohol solvent. The diluted sample is incubated at an optimal temperature in an incubator and either tested locally, or sent in a shipping incubator to a second location that is a remote test location. Detection signals are output to the processing device which is programmed to determine an indication of the transmission path length difference between the video signal cables.