Electronic circuit board; Oscilloscopes; Panel meters, namely, an electronic instrument that displays an input signal in either a digital or analog form; pH meters; Power supplies; Sound level meters; Test pins for testing printed circuit boards; Testing apparatus for testing printed circuit boards; Tool measuring instruments; Air quality measurement apparatus, namely, particle counters; Analog multimeters; Component feature of an oscilloscope, namely, an electrical signal acquisition mode; Computer whiteboards; DC/AC power converters; Digital multimeters; Digital pH meters; Electric power converters; Electronic power supplies for driving electric motors; Electronic controllers for use with power converters; Electronic instruments, namely, logic analyzers; Electronic interactive whiteboards; Electronic products for the generation, measurement, and analysis of audio signals, namely, audio analyzers; Electronic testing equipment, namely, sound level meters; Laboratory equipment and supplies, namely, thermometers; Thermometers, not for medical purposes; Voltage stabilizing power supply