Temperature meters, namely, thermometers, temperature indicators, temperature sensors, infrared thermometers; pH meters, namely, electric meters for measuring acidity or basicity of liquids; light meters, namely, electric meters for measuring levels of present light in various wavelengths; sound level meters, namely, electric meters for measuring sound pressure; air flow meters, namely, electric meters for measuring air flow; humidity meters, namely, measuring apparatus for humidity levels in gases and air; radiation meters, namely, radiation measuring instruments, RF electromagnetic field meters; conductivity meters; multimeters, namely, electric meters that combine ammeters, voltmeters and ohmmeters; environmental meters, namely, electronic-based instruments for measuring environmental parameters such as humidity, mold, bacteria, air quality, pH, airflow, and water quality; timing meters, namely, timing sensors; ammeters, voltmeters, ohmmeters, signal generators for generating repeating or non-repeating electronic signals, namely, arbitrary function generators, Direct Digital Synthesis (DDS) function generators, function generators, handheld signal generators; pulse generators for testing electric current, and Radio Frequency (RF) generators; cathode ray tube testers and rejuvenators, oscilloscopes; semiconductor curve tracers, capacitor testers; television color signal generators; power supplies; voltage surge protectors; electric resistors and capacitor substitution boxes; television receiver pattern generator and signal substitution apparatus; transistor testers and frequency meters; portable handheld multimeters for measuring electric voltage, resistance, currency, and other test parameters, namely, continuity, diodes, capacitance, frequency, dBm, transistor gain, and logic level; digital and analog electrical multimeters, namely, ammeters, voltmeters and ohmmeters; test probes and test leads for electrical and electronic instruments; signal generators for generating repeating or non-repeating electronic signals, namely, video, stereo, function, pulse and radio frequency generators; telephone test instruments for diagnostic testing, servicing and calibration of corded and cordless telephones, answering machines and automatic dialers; oscilloscopes, namely, analog and digital storage oscilloscopes and adapters for use therewith, and parts therefor; electrical power supplies; digital test instruments, namely, component testers, circuit testers and comparators for testing transistors, resistors, capacitors, inductors, diodes, voltage regulators, and analog or digital integrated circuits; television and radio communication instruments, namely, signal level meters; frequency counters, namely, frequency meters and multifunction counters, namely, frequency counters, period counters, and totalize counters for measuring electric signals; capacitance meters for testing electrical equipment; DC loads for testing DC power supplies, namely, bench programmable DC electronic loads, economical bench DC electronic loads, and high power programmable DC electronic loads; battery analyzers