Thermal imagers and thermal cameras; electronic and electrical test and measurement instruments, namely, multimeters; test meters for measuring voltage, current, and resistance; test meters for measuring airflow; test meters for measuring water quality; combination oscilloscope and multimeters; electronic instruments for measuring and recording parameters of electrical current; electronic instruments for measuring parameters of electrical current; electronic instruments for measuring and displaying parameters of electrical current; battery-powered electronic test and measurement instruments, namely, tachometers, stroboscopes, and digital and analog sound level meters for measuring and analyzing rotational or linear surface speeds on motors, shafts, wheels or conveyor belts and for measuring noise levels and pollution; electronic light, temperature and resistance measurement meters; electronic instruments that measure and datalog humidity, temperature and light, namely, thermometers with humidity and temperature datalogging, and light meters; portable instruments for measuring chemicals in solution; portable rotation (rpm) measurement instruments