UV hard-surface disinfection system that is able to disinfect the hard surfaces in a room, while minimizing missed areas due to shadows by providing multiple UV light towers that can be placed in several areas of a room such that shadowed areas are eliminated and that can be transported by a cart that is low to the ground such that the towers may be loaded and unloaded easily by a single operator. Magnetometer measurements are generated using a magnetometer that is attached to the crane jib, while crane jib maneuvers are performed including crane jib slewing. After sampling, the CMV with the absorbed diagnostic volatiles can be placed in an ionized gas beam and introduced into a mass spectrometer or placed in a thermal desorption unit, where, upon heating, the diagnostic volatiles are released to an inlet port of an analytical instrument. Such probabilistic outputs can be employed with handwriting recognition where the probability of a handwriting sample classification is combined with language models to make better classification decisions. One of the data rates is adjusted in response to a rate-control signal. A barrier is included between the first and second portions of the overlying layer to substantially block radiation of the wavelengths emitted by the emitter.