9 Depth, measuring equipment, moisture measuring equipment, voltage measuring equipment, height measuring equipment, digital thickness gauges, and equipment for measuring hardness of materials, namely, calipers, vernier calipers, dial calipers, digital calipers, long jaw calipers, outside/inside/spring calipers, outside micrometers, digital outside micrometers, vernier height gauges, dial indicators, magnetic stands, digimatic thickness gauges, granite surface plates, precision squares, precision straight edges, protractors, taper gauges, center gauges, precision square levels, precision flat levels, rockwall hardness testers, humidity testers, light meters, [ theremocouple termperature ] * thermocouple temperature * gauges, wood moisture testers, digital thermometers, [ theremocouple ] * thermocouple * thermometers and anemometers, electronic rotating van anemometers, sound level meters, contact tachometers, non-contact tachometers, stopwatches; protective helmets for workers, solderer's helmets, batteries, scientific, nautical, surveying and electrical apparatus and instruments, namely, radios, photographic cameras; cinematographic film, optical devices, namely, optical discs, optic spark-guards, spectacles, signaling devices, namely, signal bells, signal lanterns, signaling buoys, luminous or mechanical signaling panels, signaling whistles, electronic signal transmitters, sirens; life saving and teaching apparatus and instruments, namely, life jackets, lifebelts, life buoys, life nets; cash registers, calculators, fire extinguishers; laboratory equipment and supplies, namely, incubators