Oscillographs; Photometers; Refractometers; Saccharometers; Viscosimeters; Educational apparatus, namely, manipulative blocks used as teaching aids for the visualization of math concepts; Electro-optic transducers; Electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; Measuring instrumentation and apparatus, namely, digitizers; Monitoring devices for the aquaculture industry used to monitor dissolved oxygen and temperature; Optical apparatus and i...