42 Providing on-line publications, namely, catalogs, technical and scientific handbooks, textbooks, posters, technical reference texts, and manuals for providing information about measuring, controlling, and/or regulating temperature, humidity, pressure, strain, force, flow, level, pH, load, vibration, electrical resistance, air velocity, amperage, frequency, voltage, ion concentration, conductivity, and industrial process and environmental monitoring technology, data acquisition, display, and retrieval equipment, namely, computers computer peripherals, data recorders, and data loggers